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A central aspect of the appeal of the current line of Scooby-Doo animated features for me was the introduction of the supernatural element. This was especially strong in the first two, Scooby-Doo on Zombie Island (still the best, IMO) and Scooby-Doo and the Witch's Ghost, and in the two science-fiction entries. It was the addition of overt fantasy that took this feature series out of the kiddie arena into the "All Ages" realm. But in the last few entries the fantasy element has been downplayed or eliminated altogether.
It is my understanding that in the case of Scooby-Doo and the Monster of Mexico director Scott Jeralds wanted to make a "back-to-basics" Scooby-Doo mystery which takes place before Zombie Island. I just hope that the series is not being neutered in capitulation to inordinate parental concern or other societal pressure, such as the teapot-tempest over "alternative spiritual values" in Witch's Ghost.
Doctor_Mabuse