Behind the Mask

A Slinking Fiend ... Sulking Terror ... Mad Murder!

A Secret Service agent nabs a scalpel-happy doctor who runs drugs in caskets.

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Cast

Jack Holt

Jack Hart aka Quinn

Constance Cummings

Julie Arnold

Boris Karloff

Jim Henderson

Claude King

Arnold

Edward Van Sloan

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

Willard Robertson

Capt. E.J. Hawkes

Thomas E. Jackson

Agent Burke

Harry Tenbrook

Man in Black / Henchman in Boat