الممثلون

• Craig Stevens — Col. Joe Parkman
• William Hopper — Dr. Nedrick 'Ned' Jackson
• Marvin Miller — Narrator (voice)
• Alix Talton — Marge Blaine
• Donald Randolph — Gen. Mark Ford
• Pat Conway — Sgt. Pete Allen
• Florenz Ames — Prof. Anton Gunther
• Paul Smith — Corporal
• Phil Harvey — Lou
• Paul Campbell — Lt. Fred Pizar
• Helen Jay — Mrs. Farley
• Bing Russell — State Trooper
• David McMahon — Capt. Frank Carver