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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 |
| John Randolph | Chairman of the President's Committee of Inquiry |
| Harry Lauter | General Winthrop |
| M. Emmet Walsh | General Winthrop's Aide |
| Roy E. Glenn Sr. | Lawyer |
| Peter Forster | Cardinal |
| Norman Burton | Army Officer |
| William Woodson | Naval Officer |
| Tom Lowell | Orderly |
| Gene Whittington | Marine Captain |
| Donald Elson | Curator |
| Army Archerd | Referee |
| Bill Bonds | TV Newscaster |
| James Bacon | General Faulkner |
| Ricardo Montalban | Armando |
| John Alderman | Marine Corporal (uncredited) |
| Stephen Roberts | General Brody (uncredited) |
Cornelius, Zira and Milo, apes from the future, escape to 1970s Los Angeles and pose a threat.
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