Behind the Mask

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John Francis Dillon

Director

Jack Holt

Jack Hart aka Quinn

Constance Cummings

Julie Arnold

Boris Karloff

Jim Henderson

Claude King

Arnold

Edward Van Sloan

Dr. August Steiner

Edward Van Sloan

Dr. Alec Munsell

Edward Van Sloan

Mr. X

Willard Robertson

Capt. E.J. Hawkes

Thomas E. Jackson

Agent Burke

Jessie Arnold

Eastland Hospital Nurse

Clarence Burton

Agent Gorman

Rodney Hildebrand

Cell Block Guard

Martha Mattox

Hotel Ansonia Maid

Louis Natheaux

Arnold's Secretary

Louis Natheaux

Graveyard Keeper

Harry Tenbrook

Man in Black

Harry Tenbrook

Henchman in Boat

Bertha Mann

Nurse Edwards

Jo Swerling

Writer

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