Bud Abbott

Slim

Lou Costello

Tubby

Boris Karloff

Dr. Henry Jekyll / Mr. Hyde

Craig Stevens

Bruce Adams

Helen Westcott

Vicky Edwards

Reginald Denny

Inspector

John Dierkes

Batley

Eddie Parker

Mr. Hyde (uncredited)

Carmen De Lavallade

Javanese dancer

Marjorie Bennett

Militant woman

Harry Wilson

Man Asking for Match

Harry Cording

Rough Character in the Park