Mad Monster Party?

“It's the silliest party of the year...and you're all invited!”

Baron Boris von Frankenstein (Boris Karloff) is ready to retire from monster-making and wants to hand his title to someone else. He invites the monsters of the world to his island home to choose a successor, and Dracula, the Werewolf, the Creature and Dr. Jekyll and Mr. Hyde all turn up. Jules Bass tells it in stop-motion, but more than the baron's title hangs on the guest list, because he has also found the secret of total destruction.