Calificación
Reparto

Craig Stevens
Col. Joe Parkman

William Hopper
Dr. Nedrick 'Ned' Jackson

Alix Talton
Marge Blaine

Donald Randolph
Gen. Mark Ford

Florenz Ames
Prof. Anton Gunther

Paul Smith
Corporal

Paul Campbell
Lt. Fred Pizar

Pat Conway
Sgt. Pete Allen

Phil Harvey
Lou

Helen Jay
Mrs. Farley

Bing Russell
State Trooper

David McMahon
Capt. Frank Carver

Marvin Miller
Narrator (voice)

Michael Forest
Photographer (uncredited)

Sumner Williams
C-47 Pilot (uncredited)