Scooby-Doo and the Alien Invaders is a 2000 American direct-to-video animated science fiction romantic comedy mystery film.

[1] 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.

While sleeping on the roof, Shaggy and Scooby are abducted by the aliens before they are awakened in the desert by photographer Crystal and her dog Amber, who give them a ride back to the diner.

Taking her friends to a nearby canyon to confirm her suspicions, they find a dry riverbed along with mining equipment and gold within several caves before running into Shaggy, Scooby, Crystal, and Amber.

After the MPs leave to pursue them, the aliens reveal themselves as the SALF team, who discovered the cave is part of a 19th century gold mine.

Witch's Ghost had a troubled production, with studio executives insisting the team following a script written by outside screenwriters that the crew considered unsatisfactory.

[5] David Parkinson of Radio Times, gave the film a three out of five stars, saying, "This cartoon adventure is the best of a spate of feature-length spin-offs from the much-loved TV series.