The Big Show-Off (1945)

Joe Bagley, owner of the Blue Heaven Club, tries to foster a romance between shy pianist Sandy Elliott and band vocalist June Mayfield. Joe tells June that Sandy is really a professional, masked wrestler known as "The Devil." Wally Porter, also in love with June doesn't believe the story. The real wrestler breaks a leg in a match and Sandy, in order to keep up the ruse now has to wear a cast on his leg. June attends a match and hears the real Devil announce his engagement to another girl.