Behind the Mask

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

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

Crime Horror Thriller

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)