Munster, Go Home! is a 1966 American comedy horror film based on the 1960s family television sitcom The Munsters. It was directed by Earl Bellamy, who also directed a number of episodes in the series. The film was produced immediately after the television series completed filming its original run; it included the original cast with the exception of Marilyn, who was played by Debbie Watson replacing Pat Priest from the series.
Herman Munster and his wife, Lily, learn from Cavanaugh Munster's will that they have inherited an English manor known as Munster Hall in Shroudshire, England, and that Herman has inherited the designation Lord of the Manor as "Lord Munster". The family boards the famous American transatlantic passenger ocean liner SS United States to England. Herman gets seasick, Marilyn encounters a new love and suitor Roger Moresby. Grandpa gets turned into a grey wolf upon accidentally consuming a wolf pill and has to be sneaked through British immigration and customs.
Cousins Grace and Freddie are furious that the American Munsters are getting the manor, and that Herman will be Lord Munster instead of Freddie. Grace and Freddie, with the help of their mother, Lady Effigie (Hermione Gingold), try to get rid of the Munsters, so the estate can be theirs. The American Munster couple feels right at home when Herman's English relatives try to scare them. Freddie disguises himself as a ghost, but screams and runs away when he encounters Herman. Grandpa sneaks out of bed to find out the secret of Munster Hall: a counterfeiting operation is at work in the basement operated by a mastermind known as the Gryphon.
Later, Herman enters a race, driving Grandpa's custom dragster, the "DRAG-U-LA". Grace and Freddie plot to kill Herman to stop him from winning the race; thanks to the Gryphon posing as Roger, but with Lily's help, he wins. The British Munsters and their butler, Cruikshank including his daughter, Millie the barmaid revealed to be the Gryphon, are all exposed and apprehended by the police authorities. Herman captures Freddie and Grace by tossing tires on them. Lady Effigie is sent to Shroudshire's police station with her butler by Lily and Eddie. Herman and his family donate the land and Munster Hall to the city for historic preservation. Roger and Marilyn get together and hope to see each other again. Herman and his family head for their American home.