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 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 it's real monsters that are on Mystery Inc.'s side and the disguised human beings are the main villains.

Mary Kay Bergman, also credited as Shannen Cassidy, was an American voice actress and voice-over teacher. She was the lead female voice actress on South Park from the show's debut in 1997 until her death. Throughout her career, Bergman performed voice work for over 400 television commercials and voiced over 100 cartoon, film, and video game characters.