"Mad scientist turns a man into an electrically-controlled monster to do his bidding."
Lon Chaney Jr.
as Dan McCormick
Lionel Atwill
as Dr. Paul Rigas
Anne Nagel
as June Lawrence
Frank Albertson
as Mark Adams
Samuel S. Hinds
as Dr. John Lawrence
William B. Davidson
as District Attorney Ralph B. Stanley
Ben Taggart
as Detective Sergeant Regan
Constance Bergen
as Nurse
Ivan Miller
as Doctor
Chester Gan
as Chinese Boy, Wong
George Meader
as Dr. Bruno
Frank O'Connor
as Detective
John Dilson
as Medical Examiner
Byron Foulger
as Alienist #2
Jessie Arnold
as Mrs. Frank Davis (uncredited)
James Blaine
as Charlie, Prison Guard (uncredited)
Gary Breckner
as Radio Announcer (uncredited)
Lowell Drew
as Jury Foreman (uncredited)
John Ellis
as Assistant District Attorney (uncredited)
Douglas Evans
as Police Radio Announcer (uncredited)
Jack Gardner
as Reporter (uncredited)
William Hall
as Mike - Dynamo Operator (uncredited)
Russell Hicks
as Warden Harris (uncredited)
Wright Kramer
as Judge (uncredited)
Tom Quinn
as Detective (uncredited)
Bob Reeves
as Prison Guard (uncredited)
Mel Ruick
as Defense Attorney (uncredited)
Francis Sayles
as Frank Davis (uncredited)
Paul Scott
as Prison Chaplain (uncredited)
David Sharpe
as Hay Wagon Passenger (uncredited)
Victor Zimmerman
as Dynamo Operator #2 (uncredited)
Corky
as Corky the Dog (uncredited)
George Waggner
Director
Screenplay
Harry Essex
Story
Sid Schwartz
Len Golos
Harold H. MacArthur
Art Direction
Bernard B. Brown
Sound Supervisor
Stunts
Hans J. Salter
Music Director
Charles Henderson
Music
Charles Previn
Orchestrator
Frank Skinner
Eric Wybrow
Technical Supervisor
Jack Bernhard
Associate Producer
Original Music Composer
Elwood Bredell
Director of Photography
Arthur Hilton
Editor
Jack Otterson
Russell A. Gausman
Set Decoration
Vera West
Costume Design
Jack Pierce
Makeup Artist
John P. Fulton
Special Effects
Charles Carroll
Sound
