Prof. Tom Nesbitt (as Paul Christian)
Lee Hunter
Prof. Thurgood Elson
Col. Jack Evans
Capt. Phil Jackson
Corp. Stone
Sgt. Loomis
George Ritchie
Jacob Bowman
Sgt. Willistead
Miss Ryan (as Mary Hill)
ER Doctor
First Radar Man
Dr. Morton
Dr. Ingersoll
Radio Operator (uncredited)
Screaming Woman (uncredited)
Charlie - Radar Man (uncredited)
Lighthouse Keeper (uncredited)
Nun / Nurse (uncredited)
Deckhand (uncredited)
Maj. Evans (uncredited)
Ballet-Goer (uncredited)
Soldier (uncredited)
Longshoreman (uncredited)
Trailer Commentator / Radio announcer in film (uncredited)
Cop with Rifle (uncredited)
Woman at Window (uncredited)
Miss Ryan - Secretary (uncredited)
Trailer Commentator (uncredited)
Police Officer (uncredited)
Captain George LeMay (uncredited)
Blind Man (uncredited)
Cop (uncredited)
Doctor (uncredited)
Opening Narrator / Radio Announcer (voice) (uncredited)