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Rod Steiger as Harold Ryan |
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Susannah York as Penelope Ryan |
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George Grizzard as Dr. Norbert Woodley |
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Don Murray as Herb Shuttle |
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William Hickey as Looseleaf Harper |
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Steven Paul as Paul Ryan |
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Pamelyn Ferdin as Wanda June |
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Pamela Saunders as Mildred Ryan |
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Louis Turenne as Major von Koningswald |
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C.C. Whitney as Mrs. Kestenbaum |
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Lester Goldsmith as Mr. Kestenbaum |
| Directing | Mark Robson | Director |
| Costume & Make-Up | Michael Woulfe | Costume Design |
| Production | Billy Gordon | Casting |
| Art | Ruby R. Levitt | Set Decoration |
| Art | Boris Leven | Production Design |
| Costume & Make-Up | Karl Silvera | Makeup Artist |
| Costume & Make-Up | Ben Lane | Makeup Supervisor |
| Costume & Make-Up | Virginia Darcy | Hairstylist |
| Directing | Harry Caplan | Assistant Director |
| Directing | Murray Schwartz | Second Assistant Director |
| Production | Harry Caplan | Production Manager |
| Writing | Kurt Vonnegut | Screenplay |
| Editing | Dorothy Spencer | Editor |
| Production | Lester Goldsmith | Producer |
| Production | Mark Robson | Executive Producer |
| Camera | Fred J. Koenekamp | Director of Photography |
| Production | Bernard Donnenfeld | Producer |
| Production | Robert Wise | Producer |
| Writing | Kurt Vonnegut | Theatre Play |
| Camera | John Livesley | Grip |
