Munster, Go Home!

Herman and Lily Munster learn from Cavanaugh Munster's will that they have inherited Munster Hall in Shroudshire, England, and that Herman becomes Lord Munster. They prepare for the journey and board the transatlantic SS United States to England.

Herman endures seasickness during the voyage, while Marilyn encounters a new suitor, Roger Moresby. The family settles into life aboard the liner as their English adventure begins.

Grandpa accidentally swallows a wolf pill and mutates into a grey wolf. To avoid trouble at the port, he must be sneaked through British immigration and customs.

Cousins Grace and Freddie resent the American Munsters inheriting Munster Hall and the Lord Munster title. They, with their mother Lady Effigie, scheme to get rid of the Munsters to seize the estate.

Freddie disguises himself as a ghost to scare the Munsters, but he screams and runs away when he encounters Herman. The farce reveals the cousins' desperation.

Grandpa sneaks out of bed and discovers a counterfeiting operation in the basement run by the mastermind known as the Gryphon. This secret underpins the conspirators' plans against the Munsters.

Herman enters a race driving Grandpa's dragster, the DRAG-U-LA, hoping to win and solidify his position as Lord Munster. The Gryphon disguises himself as Roger to sabotage the Munsters.

Grace and Freddie plot to kill Herman to stop him from winning the race, with the Gryphon posing as Roger. Lily helps uncover the scheme, and Herman continues toward the win.

The British Munsters and their butler Cruikshank, along with Millie the barmaid, are exposed and apprehended by the police. The Gryphon's bid to become Lady Munster is foiled.

Herman capsizes the schemes by tossing tires on Grace and Freddie, capturing them. The danger to the family is neutralized as authorities move in.

Lady Effigie is taken to Shroudshire's police station along with her loyal butler. The conspirators' plot collapses under police action.

Herman and his family donate Munster Hall and the surrounding land to the city for historic preservation, ensuring the estate's legacy endures. Roger and Marilyn also deepen their budding romance and hope to see each other again.

With the English adventure behind them, Herman and his family head back to their American home. They depart with memories of a surprising, odd, and heartwarming visit.