Herman is invited to a reunion of his old army outfit but finds himself unable to fit into his old uniform. Lily will only allow him to go if he goes on a diet. When Dr. Dudley tells him to loose a hundred pounds in a week, Herman resolves to only consume water and vitamins. Unfortunately, the last day of his diet coincides with Thanksgiving.
Marilyn is sent home from college because her tuition has not been fully paid. Herman goes to talk to the dean, but is mistaken for college basketball recruit Moose Mallory and is tricked into signing up. When the real Moose and his hick father are sent home by the coach, they decide to take out their grievance on Herman Munster.
When Herman buys ten acres of land in Happy Holliday Valley from a crooked magazine ad, the family is delighted to find it a complete wasteland. But the con artists want to get the land back when they can strike a deal to sell the area for use as a missile site. So, they decide to scare the Munsters off.
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Eddie tells his friend Sandy Baylor that his father can beat Mr. Baylor at the Mockingbird Heights drag strip. Instead, Herman ends up losing the Munsters Koach on a bet. Determined to win it back, Grandpa constructs his own roadster, the Drag-u-la, to beat 'Leadfoot' Baylor at his own game and win back the family's beloved Koach.
Herman befriends a young boy named Galen Livingston Stewart. At first he has a hard time convincing his family that the boy is real. For Galen it proves even more difficult to prove to his parents he did not imagine 'Uncle Herman' and his family. The Stewarts even hire a German psychiatrist, Dr. Siegfried Leinbach, to examine their boy.