 This movie features more Simpson voice actors than any other project  besides _"Simpsons, The" (1989)_ (qv) itself: Hank Azaria (qv),  Harry Shearer (qv) and Nancy Cartwright (I) (qv). The Simpsons  and its creators are huge Godzilla fans and Godzilla, and his roar  is used quite frequently in the show.