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Victor Buono as Leo Kroll |
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David McLean as Lt. Frank Benson |
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Diane Sayer as Barbara Wells |
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Davey Davison as Tally Raymond |
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Baynes Barron as Sgt. Mack Clyde |
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Ellen Corby as Mrs. Kroll |
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Russ Bender as Dr. Clarence Sanford |
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Jeanne Bates as Clara Thomas |
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Mimi Dillard as Thelma |
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Selette Cole as Helen Lawson |
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Michael Ryan as Detective Mel Posner |
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Wally Campo as Eggerton |
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Byron Morrow as Dr. Morton |
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John Yates as Intern |
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James B. Sikking as Police Sketch Artist |
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Robert Cranford as Jack Rosten |
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Fred Aldrich as Apartment House Manager (uncredited) |
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Benjie Bancroft as Police Officer (uncredited) |
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Fred Fisher as Detective (uncredited) |
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Kenner G. Kemp as Detective (uncredited) |
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Victor Masi as Attendant (uncredited) |
| Editing | Robert S. Eisen | Editor |
| Production | James Cresson | Producer |
| Writing | Bill S. Ballinger | Screenplay |
| Production | David Diamond | Producer |
| Production | Samuel Bischoff | Producer |
| Camera | Jacques R. Marquette | Director of Photography |
| Sound | Marlin Skiles | Original Music Composer |
| Directing | Burt Topper | Director |
| Art | Eugène Lourié | Art Direction |
| Art | Hal Pereira | Art Direction |
| Art | Sam Comer | Set Decoration |
| Art | James W. Payne | Set Decoration |
| Directing | Clark L. Paylow | Assistant Director |
