William Holden
— Al Walker
Nina Foch
— Betty
Lee J. Cobb
— Dr. Andrew Collins
Adele Jergens
— Laura Stevens
Stephen Dunne
— Owen Talbot
Lois Maxwell
— Ruth Collins
Berry Kroeger
— Mike
Steven Geray
— Prof. Fred Linder
Wilton Graff
— Frank Stevens
Robert Osterloh
— Pete
Kathryn Card
— Nora
Charles Cane
— Sheriff (uncredited)
Bill Cartledge
— Arrested Man Leaving Wagon (uncredited)
Tom Coleman
— Detective (uncredited)
G. Pat Collins
— Al's Father (uncredited)
Ellen Corby
— Agnes (uncredited)
Lester Dorr
— First Man in Police Line-Up (uncredited)
Edward Earle
— McCoy (uncredited)
Charles Ferguson
— Detective (uncredited)
Jack Gordon
— Tough Man in Line-up (uncredited)
Sam Harris
— Old Man on Bus (uncredited)
Harry Harvey Jr.
— John Larrapoe (uncredited)
Robert Hyatt
— Bobby Collins (uncredited)
Selmer Jackson
— Warden Benson (uncredited)
Paul Kruger
— Policeman in Hallway at Headquarters (uncredited)
Jimmy Lloyd
— Herb Fuller (uncredited)
Merrill McCormick
— Bus Passenger (uncredited)
Pat McGeehan
— Commentator (voice) (uncredited)
John McKee
— Policeman Departing HQ (uncredited)
Edwin Mills
— Young Prisoner (uncredited)