I'm gonna keep this short as I can. I'm gonna spoil the movie in order for people to not waste their time. This movie tries to retcon the series it's supposed to give a "resolution" to and pretends that the 13th Ghosts were all hallucinations and never existed. It also made me hate Velma in this movie because she keeps saying ghost aren't real despite her seeing real monsters in past Scooby-Doo films like Zombie Island (which they ended up making a terrible sequel to right after this movie). Don't bother.