The following is an episode list for the Rankin/Bass

Rankin/Bass

Rankin/Bass Productions, Inc. , also known as Rankin/Bass Animated Entertainment, was an American production company, known for its seasonal television specials, particularly its work in stop-motion animation. The pre-1974 library is currently owned by Classic Media,while the post-1974 library is...

 animated television series ThunderCats

ThunderCats

ThunderCats is an American animated television series that was produced by Rankin/Bass Productions debuting in 1984, based on the characters created by Tobin "Ted" Wolf. The series follows the adventures of a group of cat-like humanoid aliens...

. The pilot was shown on January 23, 1985, following which the series series began on September 12, 1985, running until 1989 for 130 episodes.

Season 1 comprises 65 episodes - a standard number for animated series at the time, as it allowed the series to be shown every weekday for thirteen weeks (one full broadcast season). In 1986, the series returned for a TV movie, "ThunderCats - Ho!", which was subsequently aired as five separate episodes worked into the continuing rerun rotation of Season 1. Beginning in 1987, the show adopted a pattern of a season of twenty new episodes per year, each season beginning with a five-part miniseries that established the new concepts and characters that would play into the events of the season that followed. For whatever reason, however, most online episode guides for the series mistakenly claim that the series only aired in two seasons of 65 episodes, concluding in December 1986, despite the fact that the years of release for the post-Season 1 episodes are clearly presented in the copyright details at the end of the credits as 1986 through 1989.

The entire series has been released on DVD

DVD

A DVD is an optical disc storage media format, invented and developed by Philips, Sony, Toshiba, and Panasonic in 1995. DVDs offer higher storage capacity than Compact Discs while having the same dimensions....

, collecting season 1 across two box-sets, with the remaining 65 episodes spread out over two further sets (misleadingly labeled as "Season 2, Volume 1" and "Season 2, Volume 2", not helping to dispel the internet-borne misconception about the show's season structure). Season 1, Volume 1 was recalled when it was discovered that the second episode was missing its background musical score, and a corrected version was released in its place. Volume 1 was released on August 9, 2005 and volume 2 on December 6, 2005.

The list below presents the episodes in their original broadcast order, which is also the order used for the DVD release of the series. However, neither this order nor the original production order of the episodes is the correct chronological story order for the series. Although there is little in the way of major continuing storyline running through ThunderCats, certain creatures reoccur and clips from other episodes are employed. At times, the order used below causes these to be presented out of order. This is only a problem in the second half of season 1, and especially affects the five episodes which comprise the mini-series Lion-O's Anointment, which are split up throughout the latter half of the season, when the stories featured are supposed to occur on consecutive days.

Pilot (1985)

Title	|Writer	|Production code	# Number sign Number sign is a name for the symbol #, which is used for a variety of purposes including, in some countries, the designation of a number...
Exodus	Leonard Starr Leonard Starr Leonard Starr is a Golden Age comic book artist, an advertising artist and award-winning cartoonist, notable for creating the newspaper strip On Stage and reviving Little Orphan Annie.-Early life:...	January 23, 1985	1	1
	The Thundercats must find a new home after their home planet, Thundera, explodes. Their journey changes when an enemy force known as the Mutants attack and leaves their ship severely crippled. And a young boy must learn what it means to become a man and Lord of the Thundercats as he learns to wield the power of the Sword of Omens.
The Unholy Alliance	Leonard Starr	January 23, 1985	2	2
	While exploring Third Earth, the Mutants ship is brought down by a mysterious black pyramid which is the home to Mumm-Ra, an evil demon who is willing to form an allegiance to capture the Eye of Thundera. With the young Lord of the Thundercats in sight, Lion-O is about to face his toughest enemy yet.

Season 1 (1985)

Title	|Writer	|Production code	# Number sign Number sign is a name for the symbol #, which is used for a variety of purposes including, in some countries, the designation of a number...
Berbils	Leonard Starr	September 11, 1985	3	3
	While out exploring, Lion-O and Snarf are taken prisoner by a band of small robotic bears named Ro-Bear Berbils. They soon learn that the Berbils are being frequently attacked by the Trolligs who steal their fruit to give to the Giantorrs.
The Slaves of Castle Plun-darr	Leonard Starr	September 12, 1985	4	4
	Cats Lair is nearly complete when an agitated Wilykit and Wilykat rush home to tell the other ThunderCats that the Mutants have enslaved a race of creatures called Brute Men to build their new fortress. Tygra tells the twins to stay behind as the adult ThunderCats rush off to free these peaceful creatures.
Pumm-Ra	Julian P. Gardner	September 13, 1985	5	5
	Mumm-Ra disguises himself as a Thunderian and claims to have rescued Cheetara from the mutants.
The Terror of Hammerhand	Ron Goulart Ron Goulart Ron Goulart is an American popular culture historian and mystery, fantasy and science fiction author.The prolific Goulart wrote many novelizations and other routine work under various pseudonyms: Kenneth Robeson , Con Steffanson , Chad Calhoun, R.T...  and Julian P. Gardner	September 16, 1985	6	6
	Snarf frees a unicorn from mechanized Viking berserkers who are out hunting for food.
Trouble with Time	Ron Goulart and Julian P. Gardner	September 17, 1985	7	7
	The mutants are looking for a "feminine touch" around Castle Plundar and attempts to capture natives of the 3rd Earth. Willa and her sister fights off Monkian, but both of them are cautious of the aliens (i.e. Thundercats & the Mutants). Lion-O also takes the Thundertank for a "shortlived" joyride. Whilst looking for Thundrylium in a cave Tygra begins to age at an accelerated rate.
The Tower of Traps	Leonard Starr	September 18, 1985	8	8
	In search of a piece of stolen jewellery, Wilykat becomes a prisoner locked up in a tower as Lion-O and Wilykit must find their way to him through a maze of booby trap Booby trap A booby trap is a device designed to harm or surprise a person, unknowingly triggered by the presence or actions of the victim. As the word trap implies, they often have some form of bait designed to lure the victim towards it. However, in other cases the device is placed on busy roads or is... s.
The Garden of Delights	Barney Cohen and Julian P. Gardner	September 19, 1985	9	9
	Mumm-Ra drugs Tygra and uses him against his fellow ThunderCats to steal the Sword of Omens making them vulnerable as Mumm-Ra soon takes them prisoner.
Mandora - The Evil Chaser	William Overgard William Overgard William Overgard , was an American cartoonist and writer with a diverse opus, including novels, screenplays, animation, and the comic strips Steve Roper and Mike Nomad and Rudy. For a picture, see his biography card at ....	September 20, 1985	10	10
	Lion-O finds what looks like a spaceship's escape pod, he opens it and inadvertently releases galactic convicts.
The Ghost Warrior	Leonard Starr	September 23, 1985	11	11
	Two Bulkans release the ghost of Grune the destroyer from his tomb, he seeks a final battle with Jaga.
The Doom-Gaze	Stephen Perry Stephen Perry (writer) Stephen J. Perry was an American writer of animated cartoons and comic books.-Biography:Perry wrote for the ThunderCats and Silverhawks television shows in the 1980s, as well as the comic book series Timespirits and ThunderCats, among others.In 2008 Perry was diagnosed with bladder cancer which...	September 24, 1985	12	12
	The ancients spirits of evil instruct Mumm-Ra to release an ancient princess who has the power to mesmerise males with her gaze.
Lord of the Snows	Bob Haney Bob Haney Robert G. "Bob" Haney was a US comic book writer, best known for his work for DC Comics. He co-created the Teen Titans as well as characters such as Metamorpho, Eclipso, Cain, and the Super-Sons.- Early life and career :...	September 25, 1985	13	13
	A meteor of pure Thundrylium crashes into the remote Hook mountain. When Lion-O goes after it, he finds himself face to face with a man of the mountain whom he must fight. This is also the first appearance of Vultureman.
The Spaceship beneath the Sands	Leonard Starr	September 26, 1985	14	14
	After repeated defeats the mutants ask Mumm-Ra to return their ship which he buried in the desert around his pyramid. Once it is resurfaced, they have new weapons to use against the ThunderCats.
The Time Capsule	Peter Lawrence Peter Lawrence Peter Anthony Lawrence FRS is a British developmental biologist at the Laboratory of Molecular Biology and the Zoology Department of the University of Cambridge...	September 27, 1985	15	15
	The ThunderCats decide it is time to search for their time capsule from Thundera which has been missing since the crash.
The Fireballs of Plun-Darr	William Overgard	September 30, 1985	16	16
	The warrior women's village is attacked by Fireballs from a new weapon inside Castle Plun-Darr. When Tygra goes to investigate, he is captured and locked into a device which will rip him apart by pulling out his four limbs.
All That Glitters	Bob Haney	October 1, 1985	17	17
	Mumm-Ra tricks Lion-O and Tygra into fighting each other which causes the Sword of Omens to break. In order to repair it the ThunderCats seek the help of a being whose powers are derived from bathing in liquid gold.
Spitting Image	Howard Post Howard Post Howard Post , aka Howie Post, was an American animator, cartoonist and comic strip and comic book writer-artist....	October 2, 1985	18	18
	After the driller captures Panthro, Mumm-Ra creates an evil clone of him to turn the people of Third Earth against the ThunderCats.
Mongor	Peter Lawrence	October 3, 1985	19	19
	While exploring, the ThunderKittens stumble across an old temple where their curiosity gets the best of them and they release a demon. It's a goat-like creature who gets more powerful as others fear him. It's up to the Thundercats to find a way to overcome their fears and defeat this monster.
Return to Thundera	Bob Haney	October 4, 1985	20	20
	The Mutants unleash a new invincible war robot while Lion-O accidentally travels back in time to Thundera after the eye of Thundera reacts with the Thunderian time capsule. There he meets his father, Claudius, who gives him a scroll containing a Mutant secret.
Dr. Dometone	William Overgard	October 7, 1985	21	21
	A frog robot swallows Wilykit. It turns out to be piloted by Dr. Dometome the scientist responsible for maintaining the ocean's plug which stops the ocean draining into the Earth's core.
The Astral Prison	Peter Lawrence	October 8, 1985	22	22
	Jaga is imprisoned within the astral plane for eternity. Lion-O must journey there to release him, however there is no way for him to return.
The Crystal Queen	Leonard Starr	October 9, 1985	23	23
	A rare and beautiful bird is captured by the Queen of a crystal kingdom.
Safari Joe	Stephen Perry	October 10, 1985	24	24
	Safari Joe comes to Third Earth looking for prey 'worthy' of being hunted. He begins hunting the ThunderCats.
Snarf Takes up the Challenge	Peter Lawrence	October 11, 1985	25	25
	After the ThunderCats are captured by Mumm-Ra, it is up to Snarf to save them.
Sixth Sense	Peter Lawrence	October 28, 1985	26	26
	A ship in trouble tries to ask the ThunderCats for help using Cheetara's sixth sense. It ends up taking control of Cheetara and putting her life in danger as the mutants attack it.
The Thunder-Cutter	William Overgard	October 29, 1985	27	27
	Mumm-Ra summons Haichiman a samurai from ancient times, and tells him the ThunderCats are evil invaders. Haichiman sets out to destroy them.
The Wolfrat	C.H. Trengove	October 30, 1985	28	28
	Vultureman builds an infiltration robot and Mumm-Ra arms it with miniturisation gas which then shrinks the ThunderCats. They must rely on a normal size Snarf to help them defeat the robot.
Feliner - Part 1	Stephen Perry	October 31, 1985	29	29
	Vultureman summons Rattaro and his Ratstar battleship who kidnaps Snarf's nephew Snarfer on the planet of Snarfs. They then bring Snarfer back to Third Earth and use him as bait to trap the ThunderCats.
Feliner - Part 2	Stephen Perry	November 1, 1985	30	30
	The ThunderCats race to try to salvage the part they need for the Feliner from the wreck of the Ratstar before the mutants can complete repairs. Snarf contemplates leaving the Thundercats forever.
Mandora and the Pirates	William Overgard	November 4, 1985	31	31
	Mandora boards a space freighter for inspection, it turns out to be the ancient space pirate ship the Jolly Rogers and she needs Lion-O's help.
Return of the Driller	Howard Post	November 5, 1985	32	32
	Mumm-Ra instructs the Driller to bore a tunnel from an acid lake to the Cats Lair. It's a race to save the Lair as they face obstacle after obstacle while trying to obtain and bring back a sponge cloud to fill the hole.
Dimension Doom	Bob Haney	November 6, 1985	33	33
	Wizz-Ra returns from the 7th dimension once every 7000 years, this time he enters Cat's Lair through a mirror in Cheetara's room. Mumm-Ra, his ancient enemy, is able to steal his magic helmet. He then enslaves the Thundercats and only Cheetara and Snarf are left to help their new friend before his time runs out.
Queen of 8 Legs	Stephen Perry	November 7, 1985	34	34
	In the kingdom of webs a new queen is born, Mumm-Ra lures Lion-O to the kingdom and the spiders trap him.
Sword in a Hole	William Overgard	November 8, 1985	35	35
	The ThunderCats respond to a space liner's SOS only to be captured by mercenaries on Mumm-Ra's pay. The Sword of Omens is cast into a black hole.
The Evil Harp of Charr-Nin	Douglas Bernstein and Denis Markell	November 11, 1985	36	36
	Wilykit and Wilykat find a magic harp containing a genie Genie Jinn or genies are supernatural creatures in Arab folklore and Islamic teachings that occupy a parallel world to that of mankind. Together, jinn, humans and angels make up the three sentient creations of Allah. Religious sources say barely anything about them; however, the Qur'an mentions that... . Mumm-Ra offers to free the genie if he helps to destroy the ThunderCats.
*Lion-O's Anointment First Day: Trial of Strength	Leonard Starr	November 12, 1985	37	37
	Snarf tells Lion-O that he must earn his title as Lord by completing five trials, the first of which will be to defeat the mighty Panthro.
The Demolisher	Bob Haney and Peter Lawrence	November 13, 1985	38	38
	A bored galactic conqueror comes to Third Earth to battle Mumm-Ra. After defeating Mumm-Ra and hearing of the ThunderCats power he rushes off to battle Lion-O.
Monkian's Bargain	Lee Schneider	November 14, 1985	39	39
	Monkian makes a deal with Mumm-Ra to give him power orbs whatever the cost.
Tight Squeeze	Stephen Perry	November 15, 1985	40	40
	After a disagreement Vultureman leaves castle Plun-darr and destroys all the mutants technology. Slithe is forced to ask Mumm-Ra to take away the ThunderCats' weapons which he seals within the sword chamber so that the ThunderCats cannot reach them.
The Micrits	Bruce Smith Bruce W. Smith Bruce W. Smith is an American character animator, film director, and television producer, best known as the creator of Disney's The Proud Family....	November 18, 1985	41	41
	Lion-O is captured by very small creatures who see him as a threat to their village, and disable Cats Lair and the Thundertank. The Mutants seize the opportunity and wreak havoc on the other Thundercats who do not know where Lion-O is.
*Lion-O's Anointment Second Day: The Trial of Speed	Leonard Starr	November 19, 1985	42	42
	Lion-O must beat Cheetara in a race to pass the second anointment trial.
The Rock Giant	Peter Lawrence	November 20, 1985	43	43
	Mumm-Ra awakens a monster made of rocks to defeat the ThunderCats.
Jackalman's Rebellion	Bruce Smith	November 21, 1985	44	44
	Jackalman forms his own army and steals weapons from the Mutants.
Turmagar the Tuska	C.H. Trengove	November 22, 1985	45	45
	A strange traveller crash lands next to Cats Lair, he enlists the ThunderCat's help to battle a war machine.
*Lion-O's Anointment Third Day: Trial of Cunning	Leonard Starr	November 25, 1985	46	46
	Lion-O must outwit Wilykit and Wilykat in the Maze of Infinity but there are more than ThunderKittens lurking about who are ready to stop him.
The Mumm-Ra Berbil	Jeri Craden	November 26, 1985	47	47
	Mumm-Ra disguises himself as an injured Ro-Bear Berbil to infiltrate Cats Lair.
Mechanical Plague	Peter Lawrence	November 27, 1985	48	48
	Mumm-Ra takes advantage of the ThunderCats being separated as they make their own home movies. He summons the greatest mechanical adversaries in an attempt to destroy them.
Trapped	Stephen Perry	November 28, 1985	49	49
	Sheltering from a storm inside an old Suspension Capsule, Wilykit and Wilykat become trapped. Things take a turn for the worse when the Mutants find out about it.
*Lion-O's Anointment Fourth Day: The Trial of Mind Power	Leonard Starr	November 29, 1985	50	50
	Lion-O must overcome Tygra's mental powers and face his greatest fear.
Excalibur	Peter Lawrence	December 2, 1985	51	51
	Mumm-Ra takes the form of King Arthur in order to claim the greatest sword of all time, Excalibur so that he can finally destroy the Sword of Omens.
Secret of the Ice King	Bob Haney	December 3, 1985	52	52
	An Ice King who has been frozen for 1,000 years is suddenly awakaned and is wreaking havoc on Hook Mountain.
Good and Ugly	Peter Lawrence	December 4, 1985	53	53
	Two aliens arrive in spaceships and fight near Cats Lair and Lion-O must learn a lesson about first impressions.
The Transfer	Lawrence DuKore and Lee Schneider	December 5, 1985	54	54
	An unknown ship containing a dangerous radioactive device approaches Third Earth.
Divide and Conquer	Lee Schneider	December 6, 1985	55	55
	Vultureman creates a voice imitator and the Mutants use it to trick the ThunderCats into splitting up to trap and destroy them.
Dream Master	Heather Winters and Annabelle Gurwitch Annabelle Gurwitch Annabelle Gurwitch is an American comedic actress. She is best known as the original hostess of TBS's Dinner and a Movie. She is also a noted author and columnist and was most recently the host of Wa$ted! on Planet Green....	December 9, 1985	56	56
	Mumm-Ra assumes the form of a Dream Master to take control of the ThunderCats unconscious selves.
Out of Sight	C.H. Trengove	December 10, 1985	57	57
	Willa is captured by the mutants so Tygra makes himself and Nayda invisible to infiltrate castle Plun-darr not knowing the consequences.
The Mountain	Danny Peary Danny Peary Danny Peary is an American film critic and sports writer. He has written many books on cinema and sports-related topics.-Biography:...	December 11, 1985	58	58
	Out of sheer boredom Lion-O climbs a mountain. The mutants decide to attack putting themselves and the ThunderCats in danger.
The Superpower Potion	C.H. Trengove	December 12, 1985	59	59
	Vultureman creates a potion that grants the drinker super powers.
Eye of the Beholder	Kenneth E. Vose	December 13, 1985	60	60
	The ThunderCats create a fake Sword of Omens and use it to trick the mutants, the plan backfires when Snarf is captured.
*Lion-O's Anointment Final Day: The Trial of Evil	Leonard Starr	December 16, 1985	61	61
	Lion-O must defeat his greatest enemy, Mumm-ra, to complete the trials.
The Trouble with ThunderKittens	Kimberly B. Morris	December 17, 1985	62	62
	Eager to prove that they are old enough for adult weapons, Wilykit and Wilykat sneak off with the adult Thundercats weapons for some practice. The Mutants seize an opportunity and the kids escape, but the weapons are now in the hands of the Mutants and the kids will have to confess to Lion-O what they did to gain his help in retrieving them.
Mumm-Rana	Bob Haney	December 18, 1985	63	63
	After a space battle the Mutants' escape pods land next to a white pyramid. Inside they meet Mumm-Rana who is the good equivalent of Mumm-Ra. Mumm-Ra arrives and takes control of her to use her power against the ThunderCats.
The Shifter	Matthew Malach	December 19, 1985	64	64
	Vultureman builds a device that switches the consciousness of two beings and takes aim at the ThunderCats.
Fond Memories	Lee Schneider	December 20, 1985	65	65
	Mumm-Ra creates a 'living' museum of the ThunderCats' greatest enemies and traps Lion-O. But his most formidable enemy is one he's not yet fought.

TV movie (1986)

Title	|Writer	|Production code	ThunderCats - Ho! Part I	Leonard Starr	September 8, 1986	66	66
Recurring nightmares of Thunderians killed on Thundera as he fled to safety with Jaga and the other ThunderCats awaken Lion-O. Jaga comes to tell him that they in fact survived and are living on Third Earth. After meeting with the other ThunderCats, they decide to begin searching for them but Mumm-Ra has plans as well.
ThunderCats - Ho! Part II	Leonard Starr	September 9, 1986	67	67
	Lion-O's rescue attempt fails and the captured Thunderians are taken to Fire Rock Mountain after another failed attempt on their part to break free from their captors.
ThunderCats - Ho! Part III	Leonard Starr	September 10, 1986	68	68
	Lion-O loses the Sword of Omens in an avalanche. Panthro battles the Fist-Pounder with the ThunderTank. The Mutants arrive at Fire Rock Mountain to take control of the prisoners.
ThunderCats - Ho! Part IV	Leonard Starr	September 11, 1986	69	69
	The Thunderians attempt to escape their prison. Lion-O arrives at Fire Rock Mountain and is confronted by Hachiman who believes Lion-O is causing the suffering of his ancestor.
ThunderCats - Ho! Part V	Leonard Starr	September 12, 1986	70	70
	Lion-O and Hachiman are reconciled and the ThunderCats close in on rescuing the Thunderians from Fire Rock Mountain. But they will need supernatural help if they are to pass through the Thundranium gasses to reach them.

Season 2 (1987)

Title	|Original airdate	|#
Mumm-Ra Lives! Part I	Leonard Starr	September 15, 1987	71	71
	Mumm-Ra is weak and he faces the threat of three new ThunderCats, so he sends the Mutants to release his old enemies the Lunatacs imprisoned in Dark Side in order to bolster the forces of evil. The ThunderCats celebration of their victory over Mumm-Ra and the welcoming of three new ThunderCats is cut short when Snarf overhears plans at Castle Plundarr after he chased Ma-Mutt there from the Berbil village.
Mumm-Ra Lives! Part II	Leonard Starr	September 16, 1987	72	72
	The Mutants succeed in releasing the Lunatacs. The ThunderCats discover their Thundrylium mine is being looted and people are being kidnapped from the villages. Lion-O and the ThunderKittens have their first run-in with a Lunatac and Bengali's skills as a blacksmith come in handy.
Mumm-Ra Lives! Part III	Leonard Starr	September 17, 1987	73	73
	The ThunderCats build the Tower of Omens to monitor for Sky Tomb which will be run by the new ThunderCats. Ma-Mutt disguised as a Berbil spies on the ThunderCats plans and the Lunatacs are sent to destroy the Tower. Snarfer contacts Snarf to tell his uncle that he's coming to Third Earth.
Mumm-Ra Lives! Part IV	Leonard Starr	September 18, 1987	74	74
	Mumm-Ra's power is restored. Snarfer makes it to Third Earth but crashes in Dark Side and the ThunderCats rush to his aid before the Lunatacs can get ahold of him.
Mumm-Ra Lives! Part V	Leonard Starr	September 19, 1987	75	75
	The ThunderCats look for Sky Tomb to free the slaves imprisoned inside it. Bengali must learn the importance of teamwork as Lion-O leaves him with guard duty. Lynx-O and Cheetarah run reconnaissance to find out if Mumm-Ra is truly back or not.
Catfight	Chris Trengove	September 22, 1987	76	76
	By disguising himself as Jaga, Mumm-Ra tricks Lion-O into believing the new ThunderCats are traitors so that they will fight amongst themselves.
Psych Out	Sandy Fries	September 23, 1987	77	77
	Mumm-Ra tells Alluro where to find a talisman that boosts the self-confidence of the one who possesses it so that they become nearly invincible. And Snarf learns that true courage comes from within.
The Mask of Gorgon	Romeo Muller Romeo Muller Romeo Muller, Jr. was an American screenwriter and actor most remembered for his screenplays such as for the 1964 TV special Rudolph the Red-Nosed Reindeer.-Early years:...	September 24, 1987	78	78
	Ma-Mutt digs up an ancient book which leads Mumm-Ra to search for the ancient evil of the mask of Gorgon.
The Mad Bubbler	Kimberly Morris	September 25, 1987	79	79
	The Lunatacs look for Thundrylium in a cave on Hook mountain only to be driven mad by a strange creature who turns them against each other.
Together We Stand	Herb Engelhardt	September 26, 1987	80	80
	Mumm-Ra coats the Bezerker's weapons and armor with Thundranium and Wilykit and Wilykat find that guarding Cats Lair is not always a breeze.
Ravage Island	George Hampton and Mike Moore	September 29, 1987	81	81
	Mumm-Ra activates a mesmerising beacon on Ravage Island which draws the ThunderCats to it and takes hold of their minds.
Time Switch	Sandy Fries	September 30, 1987	82	82
	While taking care of a dangerous Suspension Capsule, dug up near Cats Lair, Lion-O is exposed to harmful gasses inside which cause him grow younger. If the Thundercats do not find a solution in time, he will rapidly become younger until non-existent.
The Sound Stones	J. Larry Carroll	October 1, 1987	83	83
	Vultureman builds a sonic gun from a sound stone he stole in Dark Side as the Lunatacs join with him to attack the Tower of Omens.
Day of the Eclipse	Kimberly Morris	October 2, 1987	84	84
	The day of the centennial total eclipse Eclipse An eclipse is an astronomical event that occurs when an astronomical object is temporarily obscured, either by passing into the shadow of another body or by having another body pass between it and the viewer...  has arrived and any spell Mumm-Ra casts will last until the next eclipse. He declares a "Day of Decay" on the Cats Lair causing it to fall apart.
Sideswipe	William Overgard	October 3, 1987	85	85
	Chilla freezes Snarfer's spaceship as he heads back to the Tower of Omens with Berbil Mexican Takeout. When Mandora gets involved, Chilla freezes her and becomes a fugitive from the law as Mandora sets her sights on bringing her in.
Mumm-Rana's Belt	James Rose	October 6, 1987	86	86
	Luna discovers that her grandmother's magic belt is now in the possession of Mumm-Rana who claimed it after battle. She heads straight for the white pyramid with Pumyra hot on her tail.
Hachiman's Honor	J. Larry Carroll	October 7, 1987	87	87
	While Hachiman is on his way to the Tower of Omens, Luna steals his sword the ThunderCutter and gives it to an automaton Automaton An automaton is a self-operating machine. The word is sometimes used to describe a robot, more specifically an autonomous robot. An alternative spelling, now obsolete, is automation.-Etymology:... . Lion-O and the ThunderKittens head out to find their old friend.
Runaways	Bill Ratter	October 8, 1987	88	88
	Fed up of feeling useless Wilykat convinces his twin to run away from home, but living on their own is more dangerous than they realized. The other ThunderCats search desperately to find them as they all must learn a lesson in communication.
Hair of the Dog	Chris Trengove	October 9, 1987	89	89
	While all the ThunderCats except Lion-O are gone, Mumm-Ra switches Ma-Mutt with Snarf. Ma-Mutt poisons Lion-O allowing Mumm-Ra to move in.
Vultureman's Revenge	Herb Engelhardt	October 10, 1987	90	90
	Vultureman builds a Thundranium projector which is capable of creating concentrated regions of Thundranium. When the ThunderKittens damage it, he damages their spaceboard sending them off into danger and while Lion-O and Snarf search desperately for the kids, Vultureman plans his revenge.

Season 3 (1988)

Title	|Original airdate	|#
ThunderCubs Part I	Peter Lawrence		91	91
	Mumm-Ra learns of the treasure of Thundera and the Sword of Plun-darr which destroyed Thundera. He recreates Thundera and travels there whilst the ThunderCats try to find him.
ThunderCubs Part II	Peter Lawrence		92	92
	After being rescued the ThunderKittens give a presentation on their observations of New Thundera. Vultureman renovates the Rat Star to ambush the ThunderCats on their way to New Thundera.
ThunderCubs Part III	Peter Lawrence		93	93
	Mumm-Ra claims the Sword of Plun-darr and nears the treasure of Thundera. The ThunderCats land on New Thundera.
ThunderCubs Part IV	Peter Lawrence		94	94
	The Mutants arrive and Mumm-Ra has them hide a decoy Book of Omens leading the ThunderCats in the wrong direction.
ThunderCubs Part V	Peter Lawrence		95	95
	The ThunderCubs return to Third Earth and join with the ThunderKittens to mount a rescue mission which will infiltrate Sky Tomb whilst Lion-O continues to battle Mumm-Ra.
Totem of Dera	J. Larry Carroll		96	96
	Mumm-Ra recovers the Totem of Dera and learns of its healing powers which can be used to bring inanimate objects to life. He sends the Mutants out to use it against the ThunderCats.
Chain of Loyalty	Bill Ratter and Peter Lawrence		97	97
	Whilst studying the Book of Omens Lion-O learns of the Chain of Loyalty and Jaga instructs him to recover it from New Thundera. But when Mumm-Ra breaks the chain, the Thundercats turn against each other and Lion-O must find a way to stop them from destroying each other.
Crystal Canyon	Sandy Fries		98	98
	Tygra finds a powerful stone which slowly takes control of his mind. He refuses to listen as Lion-O tries to warn him that the stone is dangerous.
The Telepathy Beam	Kimberly Morris		99	99
	Vultureman uses a new weapon on Cheetara to overwhelm her sixth sense in an attempt to destroy her confidence and distract her from sensing the truth that Panthro has become a prisoner and turned slave to upgrade Sky Tomb to be able to make a trip to New Thundera.
Exile Isle	William Overgard		100	100
	The Thundercats capture the Lunatacs, put them on trial, and exile them to a desolate planet. However, there is another old enemy of the Thundercats trapped on Exile Isle, with whom the Lunatacs soon team up to plan a destructive return to Third Earth.
Key to Thundera	Matthew Malach		101	101
	During an attempt to decode the Book of Omens, Lion-O accidentally traps himself within its pages, prompting Mumm-Ra to try to steal the book from Cats' Lair. Meanwhile, Panthro discovers a mysterious key on New Thundera.
Return of the ThunderCubs	J. Larry Carroll		102	102
	Tygra, Cheetara and Panthro fall under Mumm-Ra's power on New Thundera, and he tries to use Cheetara's Sixth Sense to locate the Treasure of Thundera. To rescue his friends, Lion-O must convince the mutants to fly him from Third Earth in the Ratstar.
The Formula	Kimberly Morris		103	103
	Alluro's new superfuel formula for Sky Tomb unexpectedly seems to boost the growth of local plant and animal life to massive proportions. Luna orders the mutants to spray it around Cats' Lair, leaving the Thundercats trapped in a gigantic savage garden.
Locket of Lies	Bill Ratter		104	104
	Mumm-Ra creates an evil trinket which the Thundercats mistake for a piece of the Treasure of Thundera. It soon leads them into deep trouble on New Thundera, and nobody is around to rescue them.
Bracelet of Power	Bill Ratter		105	105
	The Feliner returns from New Thundera with a mysterious bracelet. When Snarf puts it on, he discovers it has the power to turn Thundercats into his obedient servants. While he toys with this new power, Mumm-Ra plots to steal the bracelet for his own evil purposes.
The Wild Workout	Becky Hartman		106	106
	The Lunatacs hook up exercise machines to generate power for Sky Tomb's engines, but their own laziness forces them to find Thundercats to do the hard work. Meanwhile, Mumm-Ra plans to lure the Thundercats into a freezing trap in the Caverns of Cold on New Thundera.
The Thunderscope	George Hampton and Mike Moore		107	107
	Lion-O and Snarf recover a mysterious telescope from the wreckage of their original spaceship. Mumm-Ra recognizes it as the Thunderscope, which allows its user to locate pieces of the Treasure of Thundera. Lion-O must discover its purpose and keep it out of Mumm-Ra's evil hands.
The Jade Dragon	William Overgard		108	108
	Mumm-Ra discovers the power of one of the pieces of the treasure of Thundera. The Double-Headed Dragon of Doom, or the Jade Dragon possess the power to entrap people in its stomach. The legend says that Hachiman's ancestor gave the dragon to his wife as a marriage gift, and since her father was so against their marriage, he put a curse on the dragon and it engulfed Haji-man's ancestor. Jaga freed the him, and he gave the dragon to Jaga for safe keeping. Now, the Thundercats have found the Jade Dragon, and Mumm-Ra manages to trap Lion-O and Cheetara in it. Hachiman is their only hope.
The Circus Train	William Overgard		109	109
	A bounty hunter known as Captain Bragg comes to Third Earth to help the Thundercats get rid of the Mutants and the Lunatacks. Capt Bragg tricks Wilykat in going with him and they first go after the Mutants. After capturing them, they go to capture the Lunataks. They capture all except Luna and Amuk, who free the other Lunataks, put Bragg in a cage and tie Wilykat to the train's engine.
The Last Day	J. Larry Carroll		110	110
	Impatient with Mumm-Ra failing them time and time again, the Ancient Spirits of Evil give him one final chance: destroy the Thundercats within twenty-four hours, or face exile. To this end, he is granted extraordinary power by the Spirits, and grows to a gigantic size.

Season 4 (1989)

Title	|Original airdate	|#
Return to Thundera Part I	Peter Lawrence		111	111
	The Ancient Spirits of Evil give new life to Mumm-Ra and Ma-Mutt, send them to New Thundera, and build a new Pyramid for Mumm-Ra. The Thundercats say goodbye to Third Earth and depart for Thundera, leaving Tygra and Pumyra behind to watch Cat's Lair and the Tower of Omens. The Thundercats soon arrive and begin plans to build a new lair. Mumm-Ra meanwhile learns that the planet's gravity is controlled by the Gyroscope under the Churning Rocks at the center of the planet and will use this knowledge to destroy the Thundercats and trick the Gyroscope's guardian, the ancient sorceress Jaguara.
Return to Thundera Part II	Peter Lawrence		112	112
	More and more earthquakes are occurring because of the malfunctioning Gyroscope. Meanwhile Lion-O receives a distress signal from Thunderian refugees, and he, Cheetara, and Snarf go to find them. Mumm-Ra resurrects Grune the Destroyer, and Grune seeks out Lion-O and Cheetara. Grune finds and fights them, breaks the Sword of Omens, and then he chains them up on the Churning Rocks. Snarf, who was hiding, gathers the pieces of the Sword to take back to Bengali to be fixed. Snarf gets captured by Char, a thief who wants the Sword for himself.
Return to Thundera Part III	Peter Lawrence		113	113
	Lion-O, Panthro, and the Thunderkittens take the Whisker, a new flying vehicle, to the Churning Rocks to rescue the Thunderian refugees who had called from there. The Thundercats get captured by Two-Time, a robot with 2 heads. Two-Time takes them aboard his spaceship, Dome-Down, and the Thundercats see that he has also captured the refugees. Lion-O defeats Two-Time and the refugees are freed. Meanwhile, Lynx-O, Cheetara, and Bengali spot Mumm-Ra near the Churning Rocks, and inform Lion-O of this. Lion-O, Panthro, and the Thundekittens head to the Churning Rocks and confront Mumm-Ra, who is in the form of Jaga again.
Return to Thundera Part IV	Peter Lawrence		114	114
	Mumm-Ra sends Ma-Mutt disguised as Mandora to free the Mutants from Capt. Bragg's circus train and sends Bragg and Crowman falling into deep space. The Mutants are then ordered by Mumm-Ra to get rid of Tygra and Pumyra. The Mutants attack Snowman on Hook Mt. and Snowmeyow gets Pumyra for help and Tygra contacts the real Mandora to save Bragg and Crowman. Then together, they recapture the Mutants. Meanwhile on New Thundera, the earthquake tremors grow worse and the new Cats Lair collapses trapping Snarf in the ruins. Lion-O uses the sword to contact the other Thundercats and they rush to the Lair to save Snarf.
Return to Thundera Part V	Peter Lawrence		115	115
	After another earthquake caused by Mumm-Ra ruins the new Cats Lair construction site, the Thundercats go to see Jaguara and confront Mumm-Ra. Unfortunately, Mumm-Ra puts up a force field over entrance. Jaga appears to Lion-O and tells him to use the Eye of Thundera to get to Jaguara and the Gyroscope. Lion-O does so and battles Mumm-Ra, who throws him into the bottomless pit underneath the Gyroscope. Lion-O however, manages to throw his grappling hook to the top, which pulls him back up. Lion-O then shines the signal, which goes through the force field. All the Thundercats leap through the signal which takes them through the force field. Together, they fire all their weapons at Mumm-Ra and he is defeated. But before he leaves, he breaks the cord that holds the Gyroscope above the pit and it falls through. Now, New Thundera is literally falling apart.
Leah	J. Larry Carroll and David Carren		116	116
	The Ancient Spirits of Evil bring the Mirror Wraith to Mumm-Ra, and he disguises it as a child's toy. Mumm-Ra then intercepts a thunderian escape pod which carries in it a little girl. He gives the toy to the child (Leah), and leaves. She is rescued by the Thundercats, and goes into New Cat's Lair with the doll.
Frogman	Kimberly Morris		117	117
	Wily Kit and Kat are constructing a well for the New Cat's Lair on New Thundera. The Thundercats on New Thundera receive a distress signal from Thunderian refugees trying to find their way to New Thundera. The Kittens are left alone with Snarf on at the New Cat's Lair, and Lion-O and Snarfer are out constructing an early warning device (I guess for weather purposes). The rest of the Thundercats seek out the refugees in space. When Wily Kit and Kat strike water, they accidentally unleash a monster that Jaga trapped in the underground lake centuries ago.
The Heritage	Bill Ratter and Peter Lawrence		118	118
	Wily Kit and Kat, exploring New Thundera, stumble upon an Orb of Gold, and pick it up thinking that it is a part of their Heritage. Possessed by the power of the Golden Sphere of City, the ThunderKittens get greedy, and let the power of the orb overcome them. Mumm-Ra manages to get a hold of the orb, and his powers get four times more powerful.
Screwloose	William Overgard		119	119
	Jaguara cannot work New Thundera's Gyro on her own. The Thundercats order a robot to aid her in running the Gyro. Screw Loose, a robot who specializes in Gyro's, comes to New Thundera. Mumm-Ra manages to mess up Screw Loose's brain so he becomes destructive instead of helpful. The Thundercats must help Jagara get Screw Loose under control, before the entire planet is destroyed.
Malcar	George Hampton and Mike Moore		120	120
	Mumm-Ra summons Malcar, an ancient alchemist, to return from the dead. The alchemist returns old and weak, and Mumm-Ra must restore his youth and power. Malcar regains his powers to use them against the Thundercats.
Helpless Laughter	Matthew Malach		121	121
	A convergence of the Moons of Plun-Darr causes a drought on Thundera. Panthro and Snarf go looking for water, then Ezuka, the flying Serpent of Dreary Canal wanting to get water itself, attacks Panthro and Snarf and causes them to fall into the Swamp of the Laughing Lilypads, making them laugh out of control. Ezuka attacks the Lair, still looking for water. Lion-O uses the Sword to make some rain, then he and Ben-Gali use the Thunderstrike to melt some ice, but Mumm-Ra comes along and causes a flood.
Cracker's Revenge	William Overgard		122	122
	Capt. Cracker and his mechanical parrot Polly land on Way-Out Back and free the Lunatacs and put Bragg and Crownan in one of the train's cages. They plan to go to Third Earth to attack it since most of the Thundercats are no longer on Third Earth. Meanwhile the ThunderCats have learned Cracker escaped and Snarfer and Mandora go to catch him. Bragg has Crownan ride a fire exstiquisher, so he can get into space and get help. Mandora finds him, and the three of them go to Third Earth. Mandora fights with Cracker and the Lunatacs, but is beaten and she and Snarfer are tied to her cycle and sent towards a mountain. Lion-O, Panthro, and Cheetara arrive and Lion-O saves Mandora and the others. Meanwhile Cracker and the Lunatacs go to attack Cats Lair.
The Mossland Monster	Chris Trengove		123	123
	Tygra, on a solo trip to New Thundera to meet the other Thundercats, decides to take a shortcut through a meteor shower. His ship is damaged, and he lands on an unexplored region of New Thundera. The Moss-Land. It turns out that the moss in moss-land is part of a giant monster who captures Tygra with its moss. Lion-O and Panthro set out to save Tygra and battle the Moss Monster.
Ma-Mutt's Confusion	Beth Bornstein		124	124
	Mumm-Ra has a new device, the Babylonian Barbarian Boiler, that he plans to use on Cats Lair. Ma-Mutt fools around too much and Mumm-Ra banishes him from the Pyramid. Later, the Thunderkittens, Snarf, and Snarfer bring Ma-Mutt back to Cats Lair and then Mumm-Ra fires the Boiler's beam at the Lair, which causes it to start melting. Snarfer makes a communicating device (because Ma-Mutt was trying to tell them about the beam), so they can understand Ma-Mutt. Ma-Mutt starts telling them of the Boiler, but Mumm-Ra sees this and through the Cauldron's magic brings Ma-Mutt back to the Pyramid.
Shadowmaster	Dennis J. Woodyard		125	125
	From the Shadow Realm, the Shadowmaster contacts the Ancient Spirits of Evil (ASOE), telling them of how he captured Lion-O's father, Claudus, just before Thundera blew up. Then the Shadowmaster, through a bad dream, shows Lion-O his captured father and challenges Lion-O to a fight. Lion-O goes to the Shadow Realm through the Book and Sword of Omens, and is able to fight the Shadowmaster as long as the Sword stays bonded to the book. However, the Shadowmaster sends a huge bat to steal the Sword. It succeeds, and then Lion-O becomes very weak in the Shadow Realm. Mumm-Ra meanwhile, feeling like the ASOE will turn against him in favor of the Shadowmaster, sends Ma-Mutt to secretly steal the sword from the bat and put it back near the book. This will be crucial to Lion-O's triumph in this realm.
Swan Song	William Overgard		126	126
	An Ecology Inspector (EI) comes to Thundera to inspect the new Cats Lair. His ship uses the SWAN system (Space Way Airborn Navigations) to direct him to planets all over the universe. When he arrives on Thundera, he gets ambushed by Two-Time (see Return to Thundera, Part III, this page). Two-Time uses a hologram to make the EI's ship crash into a mountain, and then when the Thundercats come to rescue the EI in the Feliner, Two-Time uses the hologram again. Lion-O manages to fly around the mountain and lands the Feliner. Meanwhile, Two-Time flies to new Cats Lair in his spaceship, Dome-Down. He actually picks up the whole Lair and keeps it inside Dome-Down.
Touch of Amortus	Bill Ratter		127	127
	Mumm-Ra orders Amortus, a being he banished to the Land of No Return centuries ago, to destroy Lynx-O. Amortus makes Lynx-O crash in the Thunderstrike, and then he touches Lynx-O's face. The spell from the touch makes Lynx-O feel like he is an outcast, so he leaves to join Amortus in the Land of No Return. The other TCats, Lion-O, Panthro, and Cheetara, go after him. In the Land of No Return, Amortus again touches Lynx-O, this time causing him to turn to stone. The other TCats arrive and try to beat Amortus, but he touches all of them, causing them to start turning to stone. But just as Lion-O is about to turn entirely to stone, he calls the Sword and it breaks them free.
The Zaxx Factor	Matthew Malach		128	128
	Vultureman escapes from exile by hijacking a bookmobile. He finds a disk containing ancient history about two powerful evil forces on Third Earth: Mumm-Ra and his enemy Zaxx. Using this information, Vultureman plots to defeat Mumm-Ra and rule the universe.
Well of Doubt	Dennis J. Woodyard		129	129
	The Thundercats use a new Tower signal to guide a Thunderian ship in; aboard are Baron Tass and Mr. Grubber, a devious pair of Thunderians. Later Lion-O sends Torr, Baron Tass and Mr. Grubber to get water, but on the way the Baron stops at the Well of Doubt and gets some of its water. The water causes a person to become very doubtful of his own abilities. When they get back to the Thundercats, Baron Tass gives some of the water to Lion-O. On the way to inspecting the new Tower in the Whisker, Lion-O feels the effects of the water and causes the Whisker to crash. Tass comes back (from getting his Guardsman, giant stone-men), and has them attack the Thundercats. Will Lion-O recover his courage and determination?
The Book of Omens	William Overgard		130	130
	Finally Panthro deciphers how to use the Key of Omens. He enters the code to open the lock and, suddenly, the Guardian of Omens is summoned and it tells the Thundercats they have 24 hours to present both the key and present four other items to the four places in disgrace (geological disasters) all over New Thundera. All was proceeding correctly except for the key, which was stolen by the evil Mumm-Ra. However, he enters the Book just when Lion-O found him and the battle will go on inside the book. This presented a somewhat legitimate finale for the complete series, with an open ending (which will continue in a short series of comics in an "after future" saga on the year 2002).

External links

• List at shipunderground.com
• Thundercats The Movie - All the news and gossip surrounding the upcoming Thundercats movie which is to be released in 2010.