Dr. Claw is a partially seen character who is the main villain

Villain

A villain is an "evil" character in a story, whether a historical narrative or, especially, a work of fiction. The villain usually is the antagonist, the character who tends to have a negative effect on other characters...

 in the animated television series Inspector Gadget

Inspector Gadget

Inspector Gadget is an animated television series that revolves around the adventures of a clumsy, simple-witted cyborg detective named Inspector Gadget – a human being with various bionic gadgets built into his body. Gadget's arch-nemesis is Dr...

and the films

Inspector Gadget (film)

Inspector Gadget is a 1999 American live-action comedy film loosely based on the 1983 animated cartoon series Inspector Gadget. It starred Matthew Broderick as the title character, along with Rupert Everett as Dr. Claw, Michelle Trachtenberg as Penny, and Dabney Coleman as Chief Quimby...

 that followed. He is the antagonist in every single episode of the original series, although in some episodes of the spinoff Gadget and the Gadgetinis

Gadget and the Gadgetinis

Gadget and the Gadgetinis is a spinoff of the classic series Inspector Gadget, developed by DiC in cooperation with Haim Saban's SIP Animation and produced from 2001 to 2003. There are 52 episodes.-Plot:...

, he is replaced by other villains.
He runs a criminal syndicate called "M.A.D.", whose mascot

Mascot

The term mascot – defined as a term for any person, animal, or object thought to bring luck – colloquially includes anything used to represent a group with a common public identity, such as a school, professional sports team, society, military unit, or brand name...

 is an evil cat

Cat

The cat , also known as the domestic cat or housecat to distinguish it from other felids and felines, is a small, usually furry, domesticated, carnivorous mammal that is valued by humans for its companionship and for its ability to hunt vermin and household pests...

 named "MAD Cat" (which he keeps by his side).