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James Whitmore as Sgt. Ben Peterson |
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James Arness as FBI Agent Robert Graham |
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Joan Weldon as Dr. Pat Medford |
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Edmund Gwenn as Dr. Harold Medford |
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Onslow Stevens as Brig. Gen. Robert O'Brien |
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Sean McClory as Maj. Kibbee |
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Sandy Descher as The Ellinson Girl |
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Chris Drake as Trooper Ed Blackburn |
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Don Shelton as Trooper Capt. Fred Edwards |
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Fess Parker as Alan Crotty |
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Mary Alan Hokanson as Mrs. Lodge |
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Olin Howland as Jensen |
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William Schallert as Ambulance Attendant |
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Ann Doran as Child Psychiatrist |
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Dub Taylor as Railroad Yard Watchman |
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Leonard Nimoy as Army Sergeant |
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Richard Deacon as Bald Reporter at L.A. News Conference |
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Forbes Murray as Government Official |
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Kenner G. Kemp as Trooper #2 |
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Charles Perry as Soldier |
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Dorothy Green as Matron |
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Willis Bouchey as Official at D.C. Meeting |
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Mary Lou Holloway as Blonde at Police Station |
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Dick York as Teenager in Police Station |
| Camera | Sidney Hickox | Director of Photography |
| Editing | Thomas Reilly | Editor |
| Production | David Weisbart | Producer |
| Directing | Gordon Douglas | Director |
| Sound | Bronislau Kaper | Original Music Composer |
| Writing | Ted Sherdeman | Screenplay |
| Art | Stanley Fleischer | Art Direction |
| Art | G.W. Berntsen | Set Decoration |
| Writing | George Worthing Yates | Story |
| Writing | Russell S. Hughes | Adaptation |
| Sound | Francis J. Scheid | Sound |
| Costume & Make-Up | Moss Mabry | Wardrobe Designer |
| Costume & Make-Up | Gordon Bau | Makeup Artist |
| Costume & Make-Up | Henry Vilardo | Makeup Artist |
| Art | Robert Turner | Props |
