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| Michael Rennie | Klaatu/Carpenter |
| Patricia Neal | Helen Benson |
| Hugh Marlowe | Tom Stevens |
| Sam Jaffe | Prof. Jacob Barnhardt |
| Billy Gray | Bobby Benson |
| Frances Bavier | Mrs. Barley |
| Lock Martin | Gort |
| Drew Pearson | Himself |
| Frank Conroy | Mr. Harley (President's secretary) (uncredited) |
| Carleton Young | Colonel in Jeep (uncredited) |
| Fay Roope | Major general (uncredited) |
| Edith Evanson | Mrs. Crockett (uncredited) |
| Robert Osterloh | Major White (uncredited) |
| Tyler McVey | Brady (uncredited) |
| John Brown | George Barley (boarder) (uncredited) |
| Glenn Hardy | |
| House Peters Jr. | |
| H.V. Kaltenborn |
Klaatu and his guardian robot, Gort, come from afar to warn Earth about nuclear war.
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