Godzilla
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Godzilla (1954) is a Japanese monster movie, directed by Ishiro Honda, starring the giant monster Godzilla. This movie spawned several sequels including an flopped American remake in 1998.
Matt Groening is a fan of the original Japanese film series.
References in the show
In the "Treehouse of Horror VI" episode "Attack of the 50 foot Eyesores", after Homer steals the Lard Lad's giant doughnut, he gets struck by lightning and comes to life. Then, he pulls his feet off the ground and stomps into the middle of the street, and emits Godzilla's trademark roar.
In "Thirty Minutes Over Tokyo" the family's flight home is briefly interrupted by a monster attack on Tokyo, featuring Godzilla and other Japanese film monsters: Gamera, Rodan, and Mothra.