After stealing a fabulously valuable diamond from a display at a local museum, the Undertaker decides to hide the gem in the corpse of one of his men and obtain it later when the heat is off.; Rocks Hannigan calls for a convention of crooks in Beach City with the aim of rubbing out Manhunter and his dog.; Captain Krass schemes to replace an American pilot who was caught trying to steal an English plane with Major Hurtz, who he intends to send to America as a spy. But Hurtz, as the Marksman, has other plans.; When the Police are unable to catch gambling joint owner Caraso with the proper evidence of his activities, the Jester goes into action to prove their case.; Wildfire, while visiting oil fields in the southwest, stumbles upon a murder. But Big Tom, the man behind the killing, thinks his liquid air gun will stop her.; The Torpedo must battle a crafty sea marauder who uses a powerful vacuum cup device to attach his craft to another, then boards it and plunders.; The Unknown helps the Comitajis against Herr Baboon by capturing a munitions train and preventing the older people from being used as human shields by the Nazis.; The Professor uses his flea circus to spread bubonic plague.