The Invisible Ray (1936)

Boris Karloff

as Dr. Janos Rukh

Bela Lugosi

as Dr. Felix Benet

Frank Lawton

as Ronald Drake

Frances Drake

as Diana Rukh

Violet Kemble Cooper

as Mother Rukh

Beulah Bondi

as Lady Arabella Stevens

Walter Kingsford

as Sir Francis Stevens

Paul Weigel

as Monsieur Noyer

Frank Reicher

as Professor Meiklejohn

Georges Renavent

as Chief of the Surete

May Beatty

as Mme. LeGrand (uncredited)

Paul McAllister

as Papa LaCosta (uncredited)

Nydia Westman

as Briggs (uncredited)

Ynez Seabury

as Celeste (uncredited)

Robert Graves

as Gendarme (uncredited)