Logopolis
Encyclopedia
Logopolis is a serial in the British
United Kingdom
The United Kingdom of Great Britain and Northern IrelandIn the United Kingdom and Dependencies, other languages have been officially recognised as legitimate autochthonous languages under the European Charter for Regional or Minority Languages...

 science fiction television series Doctor Who
Doctor Who
Doctor Who is a British science fiction television programme produced by the BBC. The programme depicts the adventures of a time-travelling humanoid alien known as the Doctor who explores the universe in a sentient time machine called the TARDIS that flies through time and space, whose exterior...

, which was first broadcast in four weekly parts from 28 February to 21 March 1981. It was Tom Baker
Tom Baker
Thomas Stewart "Tom" Baker is a British actor. He is best known for playing the fourth incarnation of the Doctor in the science fiction television series Doctor Who, a role he played from 1974 to 1981.-Early life:...

's last story as the Doctor
Doctor (Doctor Who)
The Doctor is the central character in the long-running BBC television science-fiction series Doctor Who, and has also featured in two cinema feature films, a vast range of spin-off novels, audio dramas and comic strips connected to the series....

 and marks the first appearance of Peter Davison
Peter Davison
Peter Davison is a British actor, best known for his roles as Tristan Farnon in the television version of James Herriot's All Creatures Great and Small and the fifth incarnation of the Doctor in Doctor Who, which he played from 1982 to 1984.-Early life:Davison was born Peter Moffett in Streatham,...

 in the role. This serial also marks the first appearance of Janet Fielding
Janet Fielding
Janet Fielding is an Australian actress, known for her role in the BBC science fiction television series Doctor Who as Tegan Jovanka, a companion of the Fourth Doctor, played by Tom Baker, and the Fifth Doctor, played by Peter Davison. She was born in Brisbane...

 as new companion
Companion (Doctor Who)
In the long-running BBC television science fiction programme Doctor Who and related works, the term "companion" refers to a character who travels with, and shares the adventures of the Doctor. In most Doctor Who stories, the primary companion acts as both deuteragonist and audience surrogate...

 Tegan Jovanka
Tegan Jovanka
Tegan Jovanka is a fictional character played by Janet Fielding in the long-running British science fiction television series Doctor Who. An Australian airline stewardess and a native of Brisbane who was a companion of the Fourth and Fifth Doctors, she was a regular in the programme from 1981 to...

, whilst Nyssa, played by Sarah Sutton
Sarah Sutton
Sarah Sutton is a British actress best known for her role as Nyssa in the BBC science fiction television series Doctor Who. Nyssa was a companion of Tom Baker and Peter Davison's Doctors from 1981 to 1983...

 and seen in previous serial The Keeper of Traken
The Keeper of Traken
-Cast notes:Denis Carey, who plays the Keeper, also played Professor Chronotis in the uncompleted Fourth Doctor serial Shada, and the Old Man in the Sixth Doctor story Timelash....

, returns and also joins the Doctor as a companion.

Plot

Warned of upcoming danger by the TARDIS
TARDIS
The TARDISGenerally, TARDIS is written in all upper case letters—this convention was popularised by the Target novelisations of the 1970s...

' Cloister Bell, the Doctor
Fourth Doctor
The Fourth Doctor is the fourth incarnation of the protagonist of the long-running BBC British television science-fiction series Doctor Who....

 decides to stay out of trouble, and instead spends time fixing his broken chameleon circuit by extracting the measurements of a true police box
Police box
A police box is a British telephone kiosk or callbox located in a public place for the use of members of the police, or for members of the public to contact the police...

 on Earth in order to give to the mathematicians of the planet Logopolis. He is unaware that the Master
Master (Doctor Who)
The Master is a recurring character in the British science fiction television series Doctor Who. He is a renegade Time Lord and the archenemy of the Doctor....

 is aware of his plan, and materialises his own TARDIS in a recursive loop with the Doctor's. The Doctor and Adric
Adric
Adric is a fictional character played by Matthew Waterhouse in the long-running British science fiction television series Doctor Who. He was a young native of the planet Alzarius, which exists in the parallel universe of E-Space. A companion of the Fourth and Fifth Doctors, he was a regular in the...

 work out the recursion, and attempt to flush the Master out by materialising the TARDIS in the River Thames
River Thames
The River Thames flows through southern England. It is the longest river entirely in England and the second longest in the United Kingdom. While it is best known because its lower reaches flow through central London, the river flows alongside several other towns and cities, including Oxford,...

, but instead land on a boat on the river with no sign of the Master's TARDIS. Outside, the Doctor sees a glowing white figure, the Watcher, who directs him to hurry to Logopolis. In flight, they discover they have picked up a passenger, Tegan Jovanka
Tegan Jovanka
Tegan Jovanka is a fictional character played by Janet Fielding in the long-running British science fiction television series Doctor Who. An Australian airline stewardess and a native of Brisbane who was a companion of the Fourth and Fifth Doctors, she was a regular in the programme from 1981 to...

, an airline stewardess who wandered in the TARDIS to call for help to fix her aunt's flat tyre; the Doctor informs her the Master has killed her aunt with his Tissue Compression Eliminator.

On Logopolis, where the mathematicians perform their block-transfer calculations by chant-like verbal communication, the Doctor gives the lead mathematician, the Monitor, the new dimensions for the TARDIS. Discovering the calculation result to be flawed, the Doctor discovers the Master's handiwork in the death of several mathematicians. Returning to the Monitor, the Doctor finds the Master, who through mind-control of Nyssa (who believes him to be her father) is holding the Monitor hostage. The Master demands to know the secret behind Logopolis' science and the purpose of an exact replica of a space telescope from the Pharos Project on Earth, using a device to temporarily silence the mathematicians. The Monitor is horrified to find that even when the Master disables the device, the mathematicians have gone silent, and they discover that Logopolis is being overrun by entropy
Entropy
Entropy is a thermodynamic property that can be used to determine the energy available for useful work in a thermodynamic process, such as in energy conversion devices, engines, or machines. Such devices can only be driven by convertible energy, and have a theoretical maximum efficiency when...

 and turning to dust. The Monitor reveals that their calculations were used to model Charged Vacuum Emboitments (CVEs) as a means of excising off excess entropy from this universe into others as to stave off the imminent heat death of the universe
Heat death of the universe
The heat death of the universe is a suggested ultimate fate of the universe, in which the universe has diminished to a state of no thermodynamic free energy and therefore can no longer sustain motion or life. Heat death does not imply any particular absolute temperature; it only requires that...

; without the calculations, the CVEs have disappeared. Before the Monitor turns to dust, he reveals that a program contained in the bubble memory of their computers may be able to restore one CVE. The Doctor and Master agree to work together to return to Earth and use the Pharos Project there. Meanwhile, Nyssa, after having been freed of the Master's control and Adric are abducted aboard the Doctor's TARDIS by the Watcher and taken far outside of the galaxy, where they observe a large section of the universe including the Traken Union consumed by entropy. They manage to reset the controls for Earth, locking in on the Master's TARDIS when it arrives.
While the Doctor's companions set to distract the guards, the Doctor and Master make their way to the control room and successfully execute the CVE program. However, the Master reveals he plans to hold the universe hostage, threatening to stop the program. The Doctor is forced to climb onto the telescope's dish and disconnect a power cable while the Master attempts to turn it to knock the Doctor off. While the Doctor is successful in ending the Master's threat, he hangs precariously from the dish and sees images of his various enemies before he falls to the ground. The Doctor's companions rush to the spot where he has fallen. Dying, the Doctor experiences visions of the companions that have accompanied his current form and observes, "It's the end... but the moment has been prepared for." They turn to see the Watcher approach, and as he does so he merges with the Doctor. Nyssa realises that the Watcher was the future Doctor all the time. As the companions look on, the Fourth Doctor regenerates into a new, younger body – the Fifth Doctor
Fifth Doctor
The Fifth Doctor is the fifth incarnation of the protagonist of the long-running BBC television science-fiction series Doctor Who. He is portrayed by Peter Davison....

.

Continuity

  • This story continues a loose arc of three serials featuring the Master. The trilogy began with The Keeper of Traken (1981) and concludes in Castrovalva (1982). Although the Master does not appear until Part Three, his laughter can be heard in the first two episodes and Anthony Ainley is credited accordingly.
  • The story also concludes a long thread over the preceding season, discussing entropy. In particular, Logopolis serves as punctuation to the overarching events of the earlier "E-Space Trilogy".
  • The Doctor and Adric look at Romana
    Romana
    Romana, short for Romanadvoratrelundar, is a fictional character in the long-running British science fiction television series Doctor Who...

    's now deserted room in the TARDIS and talk about her recent departure in Warriors' Gate
    Warriors' Gate
    Warriors' Gate is a serial in the British science fiction television series Doctor Who, which was written by the English author Stephen Gallagher and first broadcast in four weekly parts from 3 January to 24 January 1981...

    . The Doctor eventually jettisons her room to escape the pull of the Master's TARDIS.
  • As pointed out in About Time 5, by Lawrence Miles
    Lawrence Miles
    Lawrence Miles is a science fiction author known for his work on original Doctor Who novels and the subsequent spin-off Faction Paradox...

     and Tat Wood
    Tat Wood
    Tat Wood is co-writer of the About Time episode guides to the television series Doctor Who. This book series, begun in 2004, emphasises the importance of understanding the series in the context of British politics, culture and science. Volume Six is entirely Wood's work.Wood has also written for...

    , this serial has arguably the largest number of deaths of any Doctor Who story—albeit mostly off-camera, as the destruction of Logopolis apparently causes a significant portion of the entire universe to be swallowed by a wave of entropy. At the very least, the Traken Union is destroyed, which would put the death toll in the billions and making the Master a mass murderer of unprecedented proportions, albeit one caused incidentally.
  • Several elements of this story carry over into Castrovalva, such as the theme of recursion.
  • The spin-off
    Doctor Who spin-offs
    Doctor Who spin-offs refers to material created outside of, but related to, the long-running British science fiction television series Doctor Who....

     BBC Books
    BBC Books
    BBC Books is an imprint majority owned and managed by Random House. The minority shareholder is BBC Worldwide, the commercial subsidiary of the British Broadcasting Corporation...

     novel The Quantum Archangel
    The Quantum Archangel
    The Quantum Archangel is a BBC Books original novel written by Craig Hinton and based on the long-running British science fiction television series Doctor Who. It features the Sixth Doctor and Mel, the Master, and an appearance by an alternate version of the Third Doctor...

    by Craig Hinton
    Craig Hinton
    Craig Paul Alexander Hinton was a British writer best known for his work on various spin-offs from the BBC Television series Doctor Who....

     briefly shows an alternate timeline
    Parallel universe (fiction)
    A parallel universe or alternative reality is a hypothetical self-contained separate reality coexisting with one's own. A specific group of parallel universes is called a "multiverse", although this term can also be used to describe the possible parallel universes that constitute reality...

     where the destruction of Logopolis did result in the death of the universe. The Doctor Who Unbound audio play He Jests at Scars...
    He Jests at Scars...
    He Jests at Scars... is a Big Finish Productions audio drama based on the long-running British science fiction television series Doctor Who. The Doctor Who Unbound dramas pose a series of "What if...?" questions.-Plot:What if.....

    depicts a timeline in which the Valeyard
    Valeyard
    The Valeyard is a fictional character from the long-running British science fiction television series, Doctor Who. He is described as an aspect of the Doctor from between his twelfth and final incarnations as depicted in the TV show or regenerations in the novelization of the story...

     attempts to undo the events of this story by destroying Logopolis before the Fourth Doctor visited it.
  • This story features the Doctor's TARDIS materialising around the Master's TARDIS.
  • The Master suggests that the Time Lords will not approve of the Doctor's alliance with him and will cut all ties to him, yet this is never mentioned in any of the Doctor's later dealings with them. The 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....

     information text suggests that this is Christopher Bidmead's attempt to write the Time Lords (and the series' increasingly complex backstory) out of the series altogether, but it was never carried through in later series.

The Doctor and regeneration

  • The projection of the Doctor's future incarnation (in the form of the Watcher) is similar to the future projection of his mentor K’Anpo Rinpoche (in the form of Cho-Je) in the Doctor's previous regeneration story, Planet of the Spiders
    Planet of the Spiders
    Planet of the Spiders is a serial in the British science fiction television series Doctor Who, which was first broadcast in six weekly parts from May 4 to June 8, 1974. It was Jon Pertwee's last serial as the Doctor and marks the first, uncredited appearance of Tom Baker in the role. It also marks...

    . A similar Watcher is present in the Fifth Doctor
    Fifth Doctor
    The Fifth Doctor is the fifth incarnation of the protagonist of the long-running BBC television science-fiction series Doctor Who. He is portrayed by Peter Davison....

    's mindscape in the Winter segment of the Big Finish
    Big Finish Productions
    Big Finish Productions is a British company that produces books and audio plays based, primarily, on cult British science fiction properties...

     audio play, Circular Time
    Circular Time
    Circular Time is a British audio drama based on the long-running British science fiction television series Doctor Who. It is produced by Big Finish Productions.-Circular Time:...

    .
  • Before the Doctor falls from the dish, the enemies that mock him are the Master (as seen in The Deadly Assassin
    The Deadly Assassin
    The Deadly Assassin is a serial in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from 30 October to 20 November 1976...

    ), a Dalek
    Dalek
    The Daleks are a fictional extraterrestrial race of mutants from the British science fiction television series Doctor Who. Within the series, Daleks are cyborgs from the planet Skaro, created by the scientist Davros during the final years of a thousand-year war against the Thals...

     (Destiny of the Daleks
    Destiny of the Daleks
    Destiny of the Daleks is a serial in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from 1 September to 22 September 1979. The story introduces Lalla Ward as the newly-regenerated Romana....

    ), the Pirate Captain (The Pirate Planet
    The Pirate Planet
    The Pirate Planet is a serial in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from 30 September to 21 October 1978. It forms the second serial of The Key to Time...

    ), the Cyberleader
    Cyberman
    The Cybermen are a fictional race of cyborgs who are amongst the most persistent enemies of the Doctor in the British science fiction television series, Doctor Who. Cybermen were originally a wholly organic species of humanoids originating on Earth's twin planet Mondas that began to implant more...

     (Revenge of the Cybermen
    Revenge of the Cybermen
    Revenge of the Cybermen is a serial in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from 19 April to 10 May 1975.-Synopsis:...

    ), Davros
    Davros
    Davros is a character from the long-running British science fiction television series Doctor Who. Davros is an archenemy of the Doctor and is the creator of the Doctor's deadliest enemies, the Daleks...

     (Genesis of the Daleks
    Genesis of the Daleks
    Genesis of the Daleks is a serial in the British science fiction television series Doctor Who that was originally broadcast in six weekly parts from 8 March to 12 April 1975. It marks the first appearance of Davros, the creator of the Daleks.-Plot:...

    ), a Sontaran
    Sontaran
    The Sontarans are a fictional extraterrestrial race of humanoids from the British science fiction television series Doctor Who, and also seen in spin-off series The Sarah Jane Adventures. They were created by writer Robert Holmes.-Culture:...

     (The Invasion of Time
    The Invasion of Time
    The Invasion of Time is a serial in the British science fiction television series Doctor Who, which was first broadcast in six weekly parts from 4 February to 11 March 1978...

    ), a Zygon
    Zygon
    The Zygons are a fictional extraterrestrial race in the long-running British science fiction television series Doctor Who. They first appeared in the Fourth Doctor serial Terror of the Zygons, where it was revealed that centuries ago, the Zygon homeworld was destroyed in a stellar explosion. A...

     (Terror of the Zygons
    Terror of the Zygons
    Terror of the Zygons is a serial in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from 30 August to 20 September 1975...

    ) and the Black Guardian
    Black Guardian
    The Black Guardian is a character in the long-running British science fiction television series Doctor Who. He was played by Valentine Dyall....

     (The Armageddon Factor
    The Armageddon Factor
    The Armageddon Factor is a serial in the British science fiction television series Doctor Who, which was first broadcast in six weekly parts from 20 January to 24 February 1979...

    ).
  • After falling, as the Doctor lies sprawled on the ground, he sees visions of all the companions that previously accompanied his fourth incarnation: Sarah Jane Smith
    Sarah Jane Smith
    Sarah Jane Smith is a fictional character played by Elisabeth Sladen in the long-running British BBC Television science-fiction series Doctor Who and its spin-offs K-9 and Company and The Sarah Jane Adventures....

     (Terror of the Zygons
    Terror of the Zygons
    Terror of the Zygons is a serial in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from 30 August to 20 September 1975...

    ), Harry Sullivan
    Harry Sullivan
    Harry Sullivan is a fictional character from the British science-fiction television series Doctor Who and is a companion of the Fourth Doctor...

     (The Sontaran Experiment
    The Sontaran Experiment
    The Sontaran Experiment is a serial in the British science fiction television series Doctor Who, which was originally broadcast in two weekly parts on 22 February and 1 March 1975.-Synopsis:...

    ), Brigadier Lethbridge-Stewart
    Brigadier Lethbridge-Stewart
    Brigadier Sir Alistair Gordon Lethbridge-Stewart, generally referred to simply as the Brigadier, is a fictional character in the British science fiction television series Doctor Who, played by Nicholas Courtney...

     (Invasion of the Dinosaurs
    Invasion of the Dinosaurs
    Invasion of the Dinosaurs is a serial in the British science fiction television series Doctor Who, which was first broadcast in six weekly parts from 12 January to 16 February 1974.-Synopsis:...

    , a Third Doctor
    Third Doctor
    The Third Doctor is the third incarnation of the protagonist of the long-running BBC television science-fiction series Doctor Who. He was portrayed by actor Jon Pertwee....

     story), Leela
    Leela (Doctor Who)
    Leela is a fictional character played by Louise Jameson in the long-running British science fiction television series Doctor Who. Leela was a companion of the Fourth Doctor and a regular in the programme from 1977 to 1978...

     (The Robots of Death
    The Robots of Death
    The Robots of Death is a serial in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from 29 January to 19 February 1977.-Synopsis:...

    ), K-9
    K-9 (Doctor Who)
    K-9, or K9, is the name of several fictional robotic canines in the long-running British science fiction television series, Doctor Who, first appearing in 1977...

     (The Armageddon Factor
    The Armageddon Factor
    The Armageddon Factor is a serial in the British science fiction television series Doctor Who, which was first broadcast in six weekly parts from 20 January to 24 February 1979...

    ), Romana
    Romana
    Romana, short for Romanadvoratrelundar, is a fictional character in the long-running British science fiction television series Doctor Who...

     I (The Stones of Blood
    The Stones of Blood
    The Stones of Blood is a serial in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from October 28 to November 18, 1978...

    ) and Romana II (Full Circle
    Full Circle (Doctor Who)
    Full Circle is a serial in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from 25 October to 15 November 1980...

    ).
  • The music from the regeneration scene was later reused for the regeneration of Rowan Atkinson
    Rowan Atkinson
    Rowan Sebastian Atkinson is a British actor, comedian, and screenwriter. He is most famous for his work on the satirical sketch comedy show Not The Nine O'Clock News, and the sitcoms Blackadder, Mr. Bean and The Thin Blue Line...

    's Doctor in Doctor Who and the Curse of Fatal Death
    Doctor Who and the Curse of Fatal Death
    Doctor Who and the Curse of Fatal Death is a four-episode special of Doctor Who made for the Red Nose Day charity telethon in the United Kingdom, and broadcast on BBC One on 12 March 1999...

    .

Production

The location scenes at the Pharos Project were filmed at a BBC receiving station in Crowsley Park
Crowsley Park
Crowsley Park is a 160-acre country estate in South Oxfordshire, central-southern England, owned by the British Broadcasting Corporation .- Overview :...

, with a model standing in for the radio telescope and not the Lovell Telescope
Lovell Telescope
The Lovell Telescope is a radio telescope at Jodrell Bank Observatory, near Goostrey, Cheshire in the north-west of England. When it was constructed in 1955, the telescope was the largest steerable dish radio telescope in the world at 76.2 m in diameter;it is now the third largest, after the...

 at Jodrell Bank
Jodrell Bank
The Jodrell Bank Observatory is a British observatory that hosts a number of radio telescopes, and is part of the Jodrell Bank Centre for Astrophysics at the University of Manchester...

. The lay-by seen at the start was filmed on the southbound side of the A413 Amersham
Amersham
Amersham is a market town and civil parish within Chiltern district in Buckinghamshire, England, 27 miles north west of London, in the Chiltern Hills. It is part of the London commuter belt....

 Road, Denham near Gerrards Cross
Gerrards Cross
Gerrards Cross is a village in Buckinghamshire, England. It is in the south of the county, near the border with Greater London, south of Chalfont St Peter. Gerrards Cross is also a civil parish within South Bucks district, which was known as the Beaconsfield district from 1974 to 1980...

. The lay-by is still there but the M25
M25 motorway
The M25 motorway, or London Orbital, is a orbital motorway that almost encircles Greater London, England, in the United Kingdom. The motorway was first mooted early in the 20th century. A few sections, based on the now abandoned London Ringways plan, were constructed in the early 1970s and it ...

 now bridges the road where the scene was filmed.

Titles

  • The closing titles sequence was recompiled with Tom Baker's face removed from the closing credits of Episode 4, and with Peter Davison's face added for the following story, Castrovalva.
  • Episode 4 of this story was the last time, for the next 24 years, the lead character was listed in the credits as "Doctor Who" (thus making it the only time Peter Davison was credited as "Doctor Who"). Beginning with the next story, Castrovalva, until the series' cancellation in 1989, the character was credited simply as "The Doctor". The 1996 television film
    Doctor Who (1996)
    Doctor Who is a television movie based on the British science fiction television series Doctor Who. Developed as a co-production amongst Universal Television, BBC Television, BBC Worldwide, and the American network FOX, the 1996 television film premiered on 12 May 1996 on CITV in Edmonton,...

     did not have an on-screen credit for the Eighth Doctor
    Eighth Doctor
    The Eighth Doctor is the eighth incarnation of the protagonist of the long-running BBC television science-fiction series Doctor Who. He was portrayed by Paul McGann...

    , but listed the Seventh
    Seventh Doctor
    The Seventh Doctor is the seventh incarnation of the protagonist of the long-running BBC television science-fiction series Doctor Who. He was portrayed by the actor Sylvester McCoy....

     as the "Old Doctor". The 2005 relaunch returned the credit to "Doctor Who", and then again to "The Doctor" in "The Christmas Invasion
    The Christmas Invasion
    "The Christmas Invasion" is a 60-minute special episode of the British science fiction television series Doctor Who. It is Christmas, but there is little cause for celebration as planet Earth is invaded by aliens known as the Sycorax...

    " (at the request of David Tennant
    David Tennant
    David Tennant is a Scottish actor. In addition to his work in theatre, including a widely praised Hamlet, Tennant is best known for his role as the tenth incarnation of the Doctor in Doctor Who, along with the title role in the 2005 TV serial Casanova and as Barty Crouch, Jr...

    ).
  • Also, Episode 4 was the first to credit two actors as "Doctor Who" or "The Doctor" when a regeneration scene was involved. It also happened at the end of Episode 4 of The Caves of Androzani
    The Caves of Androzani
    The Caves of Androzani is a serial in the British science fiction television series Doctor Who, which was first broadcast in four twice-weekly parts from 8–16 March 1984. It was Peter Davison's last regular appearance as the Doctor, and marks the first appearance of Colin Baker in the role...

    . In both instances, Peter Davison was billed second.

Outside references

  • According to Christopher Bidmead, the Logopolitans employ a hexadecimal
    Hexadecimal
    In mathematics and computer science, hexadecimal is a positional numeral system with a radix, or base, of 16. It uses sixteen distinct symbols, most often the symbols 0–9 to represent values zero to nine, and A, B, C, D, E, F to represent values ten to fifteen...

    , or base-16, numerical system, a real system commonly used in computer programming. When Adric and the Monitor read strings of numbers and letters, the letters are actually the numbers between 10 and 15, expressed as single digits.
  • The Police Box
    Police box
    A police box is a British telephone kiosk or callbox located in a public place for the use of members of the police, or for members of the public to contact the police...

     that the Doctor materialises the TARDIS around in Part One was intended to be the one located at the Barnet
    Barnet
    High Barnet or Chipping Barnet is a place in the London Borough of Barnet, North London, England. It is a suburban development built around a twelfth-century settlement and is located north north-west of Charing Cross. Its name is often abbreviated to Barnet, which is also the name of the London...

     bypass, which at the time was one of the last of police boxes in the Metropolitan Police District still in its original location, though it had ceased functioning in the 1970s. It was removed in 1981 prior to the filming of this story.

In print

A novelisation of this serial, written by Christopher H. Bidmead
Christopher H. Bidmead
Christopher Hamilton Bidmead is a British writer and journalist.Bidmead trained as an actor at the Royal Academy of Dramatic Arts , later playing several roles on stage, television and radio. By the early 1970s he was scriptwriting for Thames Television, producing material for Harriet's Back in...

, was published by Target Books
Target Books
Target Books was a British publishing imprint, established in 1973 by Universal-Tandem Publishing Co Ltd, a paperback publishing company. The imprint was established as a children's imprint to complement the adult Tandem imprint, and became well known for their highly successful range of...

 in October 1982. An unabridged reading of the novelisation by Bidmead was released by BBC Audiobooks in February 2010.

Broadcast VHS and DVD releases

  • The serial was repeated on BBC2 in November/December 1981, as part of "The Five Faces of Doctor Who".
  • The story was released on VHS
    VHS
    The Video Home System is a consumer-level analog recording videocassette standard developed by Victor Company of Japan ....

    in March 1992.
  • In January 2007, the serial was released on DVD as part of a trilogy, entitled New Beginnings, alongside The Keeper of Traken and Castrovalva.

Target novelisation

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