The Mad Doctor

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)