Grandpa mixes up a love potion designed to make the opposite sex fall madly for anyone who drinks it.

Herman is suffering from insomnia. The only thing that will make him sleep is a late-night walk in the park. A 'monster' type creature has been spotted in the park at night and Lily would prefer if Herman would stay home. What she doesn’t know is that the monster is Herman!

Herman purchases ten acres in Happy Holiday Valley through a magazine ad. It turns out to be a patch of wasteland in a broken-down ghost town, so the Munsters absolutely adore it. This makes things difficult for the fly-by-night salespeople who get a better offer for the property and want to buy it back.

Herman and Lily want to buy each other an elaborate gift for their 100th Anniversary. Without telling each other, they both take night jobs as ship welders. Since the job requires them to wear protective helmets that conceal their faces, they don’t realize whom they’re dealing with when they start flirting with each other.