Bela Lugosi

Dr. Alex Zorka

Dorothy Arnold

Jean Drew

Robert Kent

Capt. Bob West

Edwin Stanley

Dr. Fred Mallory

Regis Toomey

Lt. Jim Daley

Jack C. Smith

Monk

Edward Van Sloan

Jarvis

Dora Clement

Ann Zorka

Anthony Averill

Rankin

Hugh Huntley

Perkins

Monte Vandergrift

Jarvis Goon

Frank Mayo

West's Boss

Jim Farley

Harbormaster

Eddie Acuff

Mac

Ed Wolff

The Robot

Roy Barcroft

Parker (uncredited)

Lee J. Cobb

Road Crew Foreman (uncredited)

Charles King

Car-Crash Cop (uncredited)

Ford Beebe

Director

Saul A. Goodkind

Director

George H. Plympton

Screenplay

Henry MacRae

Associate Producer

Irving Birnbaum

Editor

Basil Dickey

Screenplay

Mildred Barish

Screenplay

Alvin Todd

Editor

William A. Sickner

Director of Photography

Ralph M. DeLacy

Art Direction

Jerome Ash

Director of Photography

Joseph Gluck

Editor

Wyllis Cooper

Original Story