“Baron Boris von Frankenstein achieves his ultimate ambition, the secret of total destruction. He sends out messenger bats to summon all monsters to the Isle of Evil. The Baron intends to inform them of his discovery and also to reveal his imminent retirement as head of the Worldwide Organization of Monsters.
Frankenstein’s plan is to hand the position and his secrets over to his nephew Felix, a young pharmacist with no knowledge of monsters. Frankenstein’s assistant Francesca wants the title for herself, and she plots with Dracula to take out Felix. Over time, Francesca develops feelings for Felix, after he unknowingly saves her multiple times. Dracula, Frankenstein’s Monster, and the Monster’s Mate descend upon Francesca, who summons “It”––a gigantic gorilla ape reminiscent of King Kong––who captures all the monsters as Francesca and Felix escape.
Unhappy that the monsters had conspired against him, Frankenstein drops his secret formula, destroying the island and everyone on it.
The film was created using Rankin/Bass’ Animagic stop motion animation process, supervised by Tadahito Mochinaga of MOM Productions in Tokyo, Japan. Mad Magazine creator Harvey Kurtzman penned the script (with writer Len Korobkin) and Mad artist Jack Davis designed many of the characters.
In addition to the famous monsters seen in the film, Mad Monster Party also features several celebrity likenesses. Boris Karloff and Phyllis Diller’s characters are both designed to look like the actors portraying them, while Baron Frankenstein’s lackey, Yetch, is a physical and vocal caricature of Peter Lorre.
Mad Monster Party was one of several child-friendly projects Boris Karloff lent his voice to in his final years. It was his final involvement in a production connected to the Frankenstein mythos that had propelled him to stardom some 36 years earlier.”