Nick Adams
— John Dillinger
Robert Conrad
— 'Pretty Boy' Floyd
John Ashley
— 'Baby Face' Nelson
Dan Terranova
— John Hamilton
Mary Ann Mobley
— Elaine
Victor Buono
— Prof. Hofman
John Hoyt
— Dr. Wilson
Anthony Caruso
— Rocco
Reed Hadley
— Federal Agent Parker
Art Baker
— Warden
Emile Meyer
— Det. Jergins
Robert Osterloh
— Federal Agent Baum
Gene Roth
— Herman, Justice of the Peace
Frank Gerstle
— Watchman
Wally Rose
— Guard
Walter Sande
— Judge
Joy Harmon
— Nelson's Girl
Beverly Powers
— Floyd's Girl (as Beverly Hills)
Ted Knight
— Johnsyn
Paul Genge
— Police Detective