Basil Rathbone as Dr. George Sebastian / Dr. Langamann

Ellen Drew as Linda Booth

John Howard as Gil Sawyer

Barbara Jo Allen as Louise Watkins (as Barbara Allen [Vera Vague])

Ralph Morgan as Dr. Charles Downer

Martin Kosleck as Maurice Gretz

Kitty Kelly as Winnie

Hugh O'Connell as Lawrence Watkins

Henry Victor as Furber (Uncredited)

Wanda McKay as Girl at Charity Bazaar (Uncredited)

James Seay as Intern (Uncredited)

William Benedict as Mickey Barnes (Uncredited)

George Chandler as Elevator Operator (Uncredited)

Edward Earle as Librarian (Uncredited)

Chuck Hamilton as Police Officer at Train Station (Uncredited)

Harry Hayden as Ticket Clerk (Uncredited)

Douglas Kennedy as Hotel Clerk (Uncredited)

John Laing as Intern (Uncredited)

Charles McAvoy as Officer Riley (Uncredited)

Howard M. Mitchell as Butler (Uncredited)

Ruth Rogers as Woman at Charity Bazaar (Uncredited)

Sheila Ryan as Hostess at Charity Bazaar (Uncredited)

Hugh Sothern as Dr. Hatch (Uncredited)

Max Wagner as Cab Driver (Uncredited)