Whit Bissell
Prof. Frankenstein
Phyllis Coates
Margaret
Robert Burton
Dr. Karlton
Gary Conway
Bob / Teenage Monster
George Lynn
Sgt. Burns
John Cliff
Sgt. McAffee
Marshall Bradford
Dr. Randolph
Claudia Bryar
Arlene's Mother
Angela Austin
First Victim
Russ Whiteman
Dr. Elwood
Charles Seel
Mr. Sexton, the jeweler
Paul Keast
Man at Crash
Gretchen Thomas
Woman in Corridor
Patrick Miller
Police Officer (as Pat Miller)
Joy Stoner
Arlene
Larry Carr
Young Man (uncredited)
George DeNormand
Party Guest (uncredited)
James Gonzalez
Party Guest (uncredited)
Frank McLure
Party Guest (uncredited)
William H. O'Brien
Rooming House Boarder (uncredited)
Norman Stevans
Party Guest (uncredited)
Arthur Tovey
Party Guest (uncredited)