Jerry McGuire (William Collier Jr.) is a fashion designer who is in love with shop girl Hilda Jenson (Shirley Mason). However, prizefighter Spike Mullins (Johnny Walker) also loves Hilda. Jerry is undeterred by the fact that he is physically no match for the muscular Spike. He takes boxing lessons and, with Hilda's help, ensures that Spike is overfed before their big fight.