Dr. Paul Venner

James Stephenson

Dr. Mary Murray

Geraldine Fitzgerald

Miss Leeming

Barbara O'Neil

Dr. Drewett

Donald Crisp

Dr. Blake

Montagu Love

Professor Herman Von Reiter

Sig Ruman

Dr. Thornton

G.P. Huntley

Dr. Hale

Richard Ainley

Dr. Thornton

G. P. Huntley

Dr. Bentley

Bruce Lester

Mr. Tom Foster

Leonard Mudie

Mrs. Foster

Doris Lloyd

Dr. Esternazy

Frank Reicher

Miss Hoffman

Hermine Sterler

Chivers

Billy Bevan

Miss Dennis

Clare Verdera

Dr. Corliss

Crauford Kent

Jeweler

Alec Craig

Mrs. Kent a Patient (uncredited)

Mary Taylor

Dr. Bentley

Bruce Lister

Nurse (walk-on)

Bette Davis