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When fugitive human astronaut Virdon is shot, his chimp companion Galen must charm an old flame into accepting that a book on human surgery is no hoax. Meanwhile, their friend Burke is captured by the ape authorities and is to be brainwashed by a brilliant ape scientist named Wanda. [The fourth of five telefilms edited from episodes of the 1974 TV series; this film combines the episodes "The Surgeon" and "The Interrogation"]