Basil Rathbone
Dr. George Sebastian / Dr. Langamann
Ellen Drew
Linda Booth
John Howard
Gil Sawyer
Barbara Jo Allen
Louise Watkins (as Barbara Allen [Vera Vague])
Ralph Morgan
Dr. Charles Downer
Martin Kosleck
Maurice Gretz
Kitty Kelly
Winnie
Hugh O'Connell
Lawrence Watkins
Henry Victor
Furber (Uncredited)
Wanda McKay
Girl at Charity Bazaar (Uncredited)
James Seay
Intern (Uncredited)
William Benedict
Mickey Barnes (Uncredited)
George Chandler
Elevator Operator (Uncredited)
Edward Earle
Librarian (Uncredited)
Chuck Hamilton
Police Officer at Train Station (Uncredited)
Harry Hayden
Ticket Clerk (Uncredited)
Douglas Kennedy
Hotel Clerk (Uncredited)
John Laing
Intern (Uncredited)
Charles McAvoy
Officer Riley (Uncredited)
Howard M. Mitchell
Butler (Uncredited)
Ruth Rogers
Woman at Charity Bazaar (Uncredited)
Sheila Ryan
Hostess at Charity Bazaar (Uncredited)
Hugh Sothern
Dr. Hatch (Uncredited)
Max Wagner
Cab Driver (Uncredited)
Tim Whelan
Director
Howard J. Green
Screenplay
George M. Arthur
Producer
Victor Young
Original Music Composer
Ted Tetzlaff
Director of Photography
Archie Marshek
Editor
Hans Dreier
Art Direction
Robert Usher
Art Direction
Edith Head
Costume Design
Gordon Jennings
Special Effects
Adolph Zukor
Presenter
Joseph C. Youngerman
Assistant Director
A. E. Freudeman
Interior Designer
John Cope
Sound Recordist
Harry D. Mills
Sound Recordist
Farciot Edouart
Visual Effects
Stephan Pasternacki
Additional Music