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|Place of origin:||Earth, Alternate timeline|
|Appearance:||The Mutant Phase|
|Main actor:||Mark Gatiss|
Professor Karl Hendryk was one of the few survivors of planet Earth in the 43rd century of an alternate timeline. He showed the Fifth Doctor a dead Mutant Phase creature. Karl was exterminated by the Daleks when he tried to fight them with a handgun. (AUDIO: The Mutant Phase)