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After 20th Century-Fox's "Planet of the Apes" film series had run its theatrical course, the next logical step seemed to be a TV spin-off. Originally telecast September 13 to December 27, 1974, the TV version of Planet of the Apes stars Ron Harper and James Naughton as Alan Virdon and Pete Burke, two 20th-century astronauts who land on a planet where articulate apes rule and bestial humans are treated like cattle. It is giving nothing away at this late date to reveal that the Planet of the Apes is actually a futuristic, post-apocalyptic earth. After the series ran its network course, its episodes were re-edited into six "feature films," each comprised of two hour-long installments. Forgotten City of the Planet of the Apes concerns itself with hidden colonies of insurgent humans who intend to topple the ape hierarchy. Carried over from the Apes films is Roddy McDowell as intellectual chimpanzee Cornelius.