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