Cast
Edward Van Sloan
Dr. August Steiner / Dr. Alec Munsell / Mr. X
Martha Mattox
Hotel Ansonia Maid
Jessie Arnold
Eastland Hospital Nurse
Constance Cummings
Julie Arnold
Claude King
Arnold
Willard Robertson
Capt. E.J. Hawkes
Thomas E. Jackson
Agent Burke
Harry Tenbrook
Man in Black / Henchman in Boat
Jack Holt
Jack Hart aka Quinn
Boris Karloff
Jim Henderson
Bertha Mann
Nurse Edwards