Caractacus P. Doom is the main antagonist in the 1993 British animated TV series Avenger Penguins. He is an insane and reclusive criminal scientist who devises different plans to take over Big City (the show's setting), and eventually, the world, only to be always foiled by the eponymous biker penguins of the title. He is patterned on an elderly Orson Welles and his bumbling assistant, Harry Slime, is always love-sick much to his chagrin.

He is voiced by Mike McShane, who also voices supporting protagonist Marlon amongst others.

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