Joe Palooka and Anne Howe go to Harrow Hot Springs to spend their honeymoon and shortly after they arrive, Humphrey Pennyworth, good-natured, small-town blacksmith, who has repaired their car, arrives and explains that he always guarantees his work for 30 days and wants to be on hand to ensure the motor works okay. Before long, Joe is matched in a benefit bout with Johnson, but the latter is replaced by Humphrey after being kayoed by him after he insulted Joe. Johnson's manager, Belden, quickly tries to arrange to manage Humphrey, but Joe's manager Knobby Walsh realizes that Humphrey's amazing super strength is a menace to Joe's career, so he poses as English fight manager Lord Cecil Poole and takes over the management of Humphrey. Belden has a couple of his henchmen kidnap Poole/Walsh.