Mad Monster Party

On the Isle of Evil, Baron Boris von Frankenstein reveals his imminent retirement and that he has refined the secret of total destruction, only to be upset when the other monsters try to steal the secret and kill his nephew, Felix Flanken.

Mad Monster Party? is a 1967 stop-motion animated musical comedy film produced by Rankin/Bass Productions for Embassy Pictures. The film stars the voices of Boris Karloff, Allen Swift, Gale Garnett, and Phyllis Diller. It tells the story of a mad scientist who achieves the secret of total destruction as he summons all the monsters to his island home to show it off while planning to retire as the head of the "Worldwide Organization of Monsters".