Scooby-Doo and the Alien Invaders is the third of a series of Direct-to-video animated films based upon the Scooby-Doo Saturday morning cartoons. It was released on October 3, 2000, and it was produced by Warner Bros. Animation (though it had a Hanna-Barbera Cartoons logo and copyright notice at the end). Unlike the previous films, in spite of the grimmer atmosphere, it also had a lighter tone since the real monsters are the good guys and the disguised humans are the primary antagonists. It is the third of the first four Scooby Doo direct-to-video films to be animated overseas by Japanese animation studio Mook Animation.