The family boards the famous American transatlantic passenger ocean liner SS United States to England.

Herman gets seasick, Marilyn (Debbie Watson) encounters a new love and suitor Roger Moresby (Robert Pine).

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.

This film offered audiences an opportunity to see the Munsters in Technicolor rather than the black-and-white format of the television series, but was not a commercial success upon its original theatrical release.

It was produced and released at least partly in order to introduce the characters and concept to foreign audiences, as it came in advance of international syndication for the film's source material (the television series' 70 episodes).

For the Transatlantic crossing, stock footage of the American passenger ocean liner, the SS United States, near the end of its active career, was utilized.

Although most of the film is set in fictional "Shroudshire, England" the automobile racing scenes were shot at the Paramount Ranch Racetrack in Agoura, California.