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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)
Patti McKaye
Can-can dancer
Betty Tyler
Can-can dancer
Lucille Lamarr
Can-can dancer
Dante De Paolo
Specialty dancer