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After slipping through a time warp, astronauts Burke (James Naughton) and Virdon (Ron Harper) land on an earth in which evolved simians rule and humans are treated as mute beasts. On the run from warlike gorilla Gen. Urko, they're aided by kindhearted chimp Galen (Roddy McDowall). In this movie, edited from two episodes of the "Planet of the Apes" TV series, the trio saves poor farmers from a ruthless tyrant, and Virdon competes in a risky horse race against Urko.