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Scooby-Doo and the Alien Invaders is a 2000 American direct-to-video animated science fiction romantic comedy mystery film. It is the third direct-to-video film based on Scooby-Doo Saturday morning cartoons. The film was produced by Warner Bros. Animation in association with Hanna-Barbera. It is the third of the first four Scooby-Doo direct-to-video films to be animated overseas by Japanese animation studio Mook Animation. Unlike the previous films and despite the grimmer atmosphere, it has a lighter tone since the real monsters are on Mystery Inc.'s side and the disguised human beings are the main villains.