Boris Karloff

Character: Dr. Victor Sartorius

Joan Wyndham

Character: Eve Rowe

Arthur Margetson

Character: Roger Clifford

Mona Goya

Character: Yvonne Clifford

Anthony Ireland

Character: Capt. Arthur Halliday

Morton Selten

Character: Sir Charles Clifford

Nina Boucicault

Character: Mary Clifford

Gibb McLaughlin

Character: Jacques

J.H. Roberts

Character: Chalmers

Victor Rietti

Character: Doctor Bousquet

Wilfrid Caithness

Character: Morrocan Official