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