Edward G. Robinson

John Triton

Gail Russell

Jean Courtland

John Lund

Elliott Carson

Virginia Bruce

Jenny

William Demarest

Lt. Shawn

Richard Webb

Peter Vinson

Jerome Cowan

Whitney Courtland

Onslow Stevens

Dr. Walters

John Alexander

Mr. Gilman

Roman Bohnen

Special Prosecutor Melville Weston

Luis van Rooten

Mr. Myers

Douglas Spencer

Dr. Ramsdell

Dorothy Abbott

Maid (uncredited)

Julia Faye

Companion (uncredited)

Pat Flaherty

Policeman (uncredited)

Frank Hagney

Truckman (uncredited)

Minerva Urecal

Elderly Italian Woman (uncredited)

Margaret Field

Agnes (uncredited)

Stuart Holmes

Scientist (uncredited)