The Brain

Anne Heywood

— Anna Holt

Peter van Eyck

— Dr. Peter Corrie

Cecil Parker

— Stevenson

Bernard Lee

— Dr. Frank Shears

Ellen Schwiers

— Ella

Siegfried Lowitz

— Mr. Walters

Hans Nielsen

— Immerman

Jeremy Spenser

— Martin Holt

Maxine Audley

— Marion Fane

Jack MacGowran

— Furber

Miles Malleson

— Dr. Miller

George A. Cooper

— Thomas Gabler

Dieter Borsche

— Dr. Miller

Ann Sears

— Stevenson's secretary

Irene Richmond

— Mrs. Gabler

Allan Cuthbertson

— Da Silva

Bandana Das Gupta

— Miss Soong

Alister Williamson

— Inspector Pike

Patsy Rowlands

— Young Woman at Dance Hall (uncredited)

Bryan Pringle

— Dance Hall MC (uncredited)

John Junkin

— Frederick (uncredited)