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Richard Egan as David Sheppard |
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Constance Dowling as Joanna Merritt |
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Herbert Marshall as Dr. Van Ness |
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John Wengraf as Dr. Zeitman |
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Philip Van Zandt as Dr. Pierre Elzevir |
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Valerie Vernon as Mme. Elzevir |
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Byron Kane as Dr. Carter |
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Stephen Roberts as Maj. Howard |
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Michael Fox as Dr. Hubertus |
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Aline Towne as Dr. Kirby |
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Marian Richman as Helen |
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Jean Dean as Marna |
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William Schallert as Engle |
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David Alpert as Dr. Peter Burden |
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Tom Daly as Senator |
| Directing | Herbert L. Strock | Director |
| Writing | Tom Taggart | Screenplay |
| Editing | Herbert L. Strock | Editor |
| Crew | Richard G. Taylor | Additional Dialogue |
| Art | William Ferrari | Art Direction |
| Art | Victor A. Gangelin | Set Decoration |
| Production | Ivan Tors | Producer |
| Sound | Harry Sukman | Original Music Composer |
| Writing | Ivan Tors | Story |
| Camera | Lothrop B. Worth | Director of Photography |
