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Robert Vaughn as Bill Fenner |
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Felicia Farr as Claire Connor |
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Karlheinz Böhm as Robert Wahl |
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Luciana Paluzzi as Giulia Almeranti |
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Boris Karloff as Dr. Pierre Vaugiroud |
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Roger C. Carmel as Mike Ballard |
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Ed Asner as Frank Rosenfeld |
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Joe De Santis as Jan Aarvan |
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Fabrizio Mioni as Russo |
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Bill Weiss as Goldsmith |
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Elke Sommer as Sandra Fane |
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Wesley Lau as Neill Carlson |
| Directing | Jerry Thorpe | Director |
| Writing | Helen MacInnes | Novel |
| Writing | E. Jack Neuman | Writer |
| Sound | ლალო შიფრინი | Original Music Composer |
| Camera | Milton Krasner | Director of Photography |
| Production | E. Jack Neuman | Producer |
| Production | Jerry Thorpe | Producer |
| Production | Lloyd Richards | Associate Producer |
| Editing | Henry Berman | Editor |
| Art | Leroy Coleman | Art Direction |
| Art | George W. Davis | Art Direction |
| Art | Henry Grace | Set Decoration |
| Art | Hugh Hunt | Set Decoration |
| Costume & Make-Up | Sydney Guilaroff | Hairstylist |
| Costume & Make-Up | William Tuttle | Makeup Artist |
| Directing | E. Darrell Hallenbeck | Assistant Director |
