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George Segal as Howard Trapp |
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Trevor Howard as Gustave Kummer |
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Robert Morley as Emile Carpeau |
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Emlyn Williams as Bernard Laroque |
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Alan Webb as Joseph Pillet |
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Lesley Dunlop as Nicole |
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Brian Croucher as Pierre |
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Connie Booth as Helen Trapp |
| Directing | George Schaefer | Director |
| Writing | James Yaffe | Writer |
| Sound | Elizabeth Parker | Original Music Composer |
| Crew | Elizabeth Parker | Special Sound Effects |
| Writing | Friedrich Dürrenmatt | Novel |
| Production | Hillard Elkins | Producer |
| Production | Mort Abrahams | Executive Producer |
| Production | Edie Landau | Producer |
| Production | Ely A. Landau | Producer |
| Production | Danny Steinmann | Associate Producer |
| Lighting | John Green | Lighting Director |
