If you’ve ever wondered what would happen if Rankin/Bass, of Rudolph the Red-Nosed Reindeer fame, decided to host a monster convention with a touch of Scooby-Doo logic and a side order of slapstick, well—congratulations, you’ve found it! Instead of reindeer and elves, this one delivers a ghoulishly goofy gathering of classic movie monsters, all wrapped…