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'Superman' and 'Superman II' (1978 and 1981)
Superhero movies didn't really exist before "Superman: The Movie" hit theaters in 1978 (because really, there's not much reason to count TV spinoffs "Superman and the Mole Men" from the early '50s and "Batman" from 1966). "Star Wars" had taken science fiction to new heights the year before, but "Superman" basically invented a genre -- and was a huge hit too. "Superman II" was nearly as good as its predecessor. The next two movies in the series didn't come close to living up to the first two, but "Superman" and "Superman II" are both great films.