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.
Starring Roddy McDowall, Kim Hunter, Bradford Dillman, Natalie Trundy, Eric Braeden, William Windom, Sal Mineo, Albert Salmi, Jason Evers, John Randolph