Boris Karloff

Prof. Nathaniel Billings

Peter Lorre

Dr. Arthur Lorentz

Maxie Rosenbloom

Maxie

Jeff Donnell

Winnie Slade

Larry Parks

Bill Layden

Maude Eburne

Amelia Jones

Don Beddoe

J. Gilbert Brampton

George McKay

Ebenezer

Eddie Laughton

Mr. Johnson

Frank Puglia

Silvio Baciagalupi

Frank Mitchell

Officer Fred

James C. Morton

Trooper Quincy

Frank Sully

Officer Joe Starrett

Patrick McVey

Munitions Plant Road Guard

Robert Emmett Keane

Alarm Clock Salesman

Lew Landers

Director

Paul Gangelin

Adaptation

Edwin Blum

Screenplay

Hal Fimberg

Story

Robert B. Hunt

Story

Morris Stoloff

Music Director

Colbert Clark

Producer

Richard Fantl

Editor

Henry Freulich

Director of Photography