Eddie needs an impressive pet to take to the school pet fair, but Spot, the fire-breathing monster, is too shy to come out of hiding. Eddie decides to take Igor the bat, but Igor is insulted by one of Herman’s wisecracks and flies away. Without Eddie’s knowing, Grandpa changes himself into a bat to impersonate Igor. This causes trouble when Eddie gives Grandpa to another student whose father wants to send him to outer space on a scientific mission.

A pair of con artists want to stage a phony accident as an insurance company scam. All they need is someone to play the part of the victim – preferably a big stupid guy with a face that looks as if it’s been in an accident. When they stumble upon Herman, they realize they’ve found the perfect guy. Posing as a couple of movie producers, they get him to sign an accident policy by pretending it’s a movie contract for a remake of DOUBLE INDEMNITY. As the crooks devise various ways to kill off their leading man, Herman becomes a stuck-up actor.

Leo Durocher, manager of the Los Angeles Dodgers, needs a power hitter for his team. When he gets conked on the head by one of Herman’s line drives from seven blocks away, he believes he has his man. He tracks Herman down and asks him to try out for the team. After Herman demonstrates his powerful force as a batter, Durocher comments: “I don’t know whether to sign him with the Dodgers or send him to Vietnam.”