Jack Holt

Jack Hart aka Quinn

Constance Cummings

Julie Arnold

Boris Karloff

Jim Henderson

Claude King

Arnold

Bertha Mann

Nurse Edwards

Edward Van Sloan

Dr. August Steiner / Dr. Alec Munsell / Mr. X

Willard Robertson

Capt. E.J. Hawkes

Thomas E. Jackson

Agent Burke

Martha Mattox

Hotel Ansonia Maid

Jessie Arnold

Eastland Hospital Nurse

Harry Tenbrook

Man in Black / Henchman in Boat

John Francis Dillon

Director

Jo Swerling

Story

Jo Swerling

Writer

Harry Cohn

Producer

Ted Tetzlaff

Director of Photography

Otis Garrett

Editor

Edward Sloman

Assistant Director