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| Roddy McDowall | Cornelius | |
| Kim Hunter | Dr. Zira | |
| Bradford Dillman | Dr. Lewis Dixon | |
| Natalie Trundy | Dr. Stephanie Branton/Stevie | |
| Eric Braeden | Dr. Otto Hasslein | |
| William Windom | The President | |
| Sal Mineo | Dr. Milo | |
| Albert Salmi | E-1 | |
| Jason Evers | E-2 | |
| Harry Lauter | Gen. Winthrop | 
| Director | 
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| Producer | Arthur P. Jacobs Frank Capra Jr. | ||
| Writer | Pierre Boulle Paul Dehn | ||
| Cinematography | Joseph F. Biroc | ||
| Musician | Jerry Goldsmith | 
|  | The world is shocked by the appearance of two talking chimpanzees, who arrived mysteriously in a U.S. spacecraft. They become the toast of society; but one man believes them to be a threat to the human race. | 
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