| Roddy McDowall | Cornelius |
| Kim Hunter | Dr. Zira |
| Bradford Dillman | Dr. Lewis Dixon |
| Natalie Trundy | Dr. Stephanie 'Stevie' Branton |
| Eric Braeden | Dr. Otto Hasslein |
| William Windom | The President |
| Sal Mineo | Dr. Milo |
| Albert Salmi | E-1 |
| Jason Evers | E-2 |
| John Randolph | Committee Chairman |
| Director | Don Taylor |
| Producer | Frank Capra Jr.; Arthur P. Jacobs |
| Writer | Pierre Boulle; Paul Dehn |
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