The Invisible Ray

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Boris Karloff

Dr. Janos Rukh

Bela Lugosi

Dr. Felix Benet

Frances Drake

Diana Rukh

Frank Lawton

Ronald Drake

Violet Kemble Cooper

Mother Rukh

Walter Kingsford

Sir Francis Stevens

Beulah Bondi

Lady Arabella Stevens

Frank Reicher

Professor Meiklejohn (Mendelssohn in end credits)

Paul Weigel

Monsieur Noyer

Georges Renavent

Chief of the Surete

Ricca Allen

Bystander

Charles Bastin

French Newsboy

May Beatty

Mme. LeGrand

Ted Billings

Counterman

Ernest A. Bouveron

French Newsboy

Helen Brown

Blind Girl's Mother

Daisy Bufford

Infant's Mother

André Cheron

Surete Official Checking Names

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