After being properly introduced by the emperor, Captain Nazi and Captain Nippon go to America to kill as many American military officers as possible. Their killing spree gained the attention of Freddy Freeman, also known as Captain Marvel Jr. After an initial confrontation where he was knocked out by Captain Nippon's spiked club, he followed their submarine to their island hideout. The two Captains tried everything from an iron maiden to the severed head of Medusa to stop Captain Marvel Jr., but it only managed to slow him down. Cutting their losses the villains made their escape using their sub while Captain Marvel Jr. saved the captured Americans and defeated their goons after escaping the iron maiden.