Dr. Paul Carruthers

Bela Lugosi

Mary Heath

Suzanne Kaaren

Joe McGinty

Arthur Q. Bryan

Chief Wilkins

Hal Price

Prof. Percival Garland Raines

John Davidson

Coroner (scenes deleted)

Billy Griffith

Walter King

Wally Rairden

Johnny Layton

Dave O'Brien

Henry Morton

Guy Usher

Maxine

Yolande Donlan

'One-Shot' McGuire

Donald Kerr

Martin Heath

Edmund Mortimer

Don Morton

Gene O'Donnell

Tommy Heath

Alan Baldwin

Roy Heath

John Ellis

Director

Jean Yarbrough

Original Story

George Bricker

Screenplay

John T. Neville

Art Direction

Paul Palmentola

Production Manager

Melville De Lay

Associate Producer

Guy V. Thayer Jr.

Director of Photography

Arthur Martinelli

Producer

Jack Gallagher

Editor

Holbrook N. Todd