Superman and Batman learn each other's secret identities when they meet on a cruise while trying to find a diamond thief.; Young Joe Harris always wanted to be a G-Man, but his physical defects prevent him from being one.....until Superman unwittingly gives Joe a chance to hold several non G-Man positions. Unfortunately, Frosty Harris and his gang plan to use Joe's physical liabilities against him in order to commit crimes.; Lois gets the bright idea of arranging an engagement for Clark Kent to a girl friend of hers, all in hopes of then being able to marry Superman. But the Man of Steel learns of the plan and arranges a scheme to de-rail that attempt.; When Jerry's girl sees another man smoking a pipe, she comments that it looks so masculine. Jerry retorts by saying that his father gave him one for his birthday and that he would bring it over to show her. He does...with surprising results!