Đạo diễn: Don Taylor
Diễn viên: Roddy McDowall, Kim Hunter, Bradford Dillman, Natalie Trundy, Eric Braeden, William Windom, Sal Mineo, Albert Salmi, Jason Evers, John Randolph
The world is shocked by the appearance of three talking chimpanzees, who arrived mysteriously in a spacecraft. Intrigued by their intelligence, humans use them for research - until the apes attempt to escape.