Behind the Mask

Main Cast (Top 10 billed, oldest first)

• Claude King as Arnold

  Age at release: 57

• Martha Mattox as Hotel Ansonia Maid

  Age at release: 52

• Edward Van Sloan as Dr. August Steiner / Dr. Alec Munsell / Mr. X

  Age at release: 49

• Jessie Arnold as Eastland Hospital Nurse

  Age at release: 47

• Willard Robertson as Capt. E.J. Hawkes

  Age at release: 46

• Thomas E. Jackson as Agent Burke

  Age at release: 45

• Boris Karloff as Jim Henderson

  Age at release: 44

• Jack Holt as Jack Hart aka Quinn

  Age at release: 43

• Bertha Mann as Nurse Edwards

  Age at release: 38

• Constance Cummings as Julie Arnold

  Age at release: 21