Mortifer and Vincent trap 13 evil spirits in a magical chest. Mortifer sacrifices himself in order for Vincent to escape. In present day, the kids screw up a case and they have to stop solving mysteries. Fred even sells off the Mystery Machine. While selling the rest of their gear, they uncover a crystal ball and are contacted by Vincent. It was a case without Velma and Fred. The others and Scrappy-Doo vanquished 12 ghosts. With a new vehicle, the gang heads off to help Vincent defeat the final ghost.
This follows The 13 Ghosts of Scooby-Doo (1985) which I never saw. I don't think that it's necessary to understand this movie. It is notable that Vincent Price voiced Vincent VanGhoul in the TV series. So, it's not so macabre to have a rando voicing an obvious Vincent Price character. The bigger issue is that Mortifer is too obvious. It's obvious right from the beginning. As for the gang, I get the forced retirement but I do not abide with selling the Mystery Machine. They can refurbish it. They can add to it. They cannot get rid of it. I do not like the new van and I hope that they do not keep it. It's only good comedically for Fred not being able to drive it. The next mystery should be tracking down the Mystery Machine. The actual mystery is a bit messy but whatever. It does go back to the standard mystery which is helpful. This is not that good but it's enough. They better get the Mystery Machine back.
