Mad Monster Party?

A brilliant but megalomaniacal scientist who has built the World-Wide Organization of Monsters. He orchestrates the Isle of Evil gathering and unveils a destructive formula, aiming to control monsters and retire as their leader. In the climax, he sacrifices himself to destroy the island and prevent misuse of his discovery.

A clever and ambitious partner who covets leadership of the monster world. She schemes with Dracula and resents Felix, using manipulation and jealousy as tools. She participates in the chaotic dynamics and pursues a future where she rises to power.

An innocent, kind-hearted but inept pharmacist from the United States who is Frankenstein's nephew and potential successor. He repeatedly foils the monsters' schemes by accident and becomes the unlikely focal point for the island's fate. In the end, his and Francesca's true natures are revealed.

Frankenstein's beautiful assistant who longs for a higher position among the monsters and quickly manipulates events. She bonds with Felix and shows moments of vulnerability, but is revealed to be a robot creation, complicating who can be trusted.

One of the invited monsters who plots with Francesca and others, using charm and menace to further his goals. He embodies the classic vampire archetype within the ensemble and participates in the factional schemes.

A fearsome, iconic monster among the guest list, embodying the era's fascination with cinematic misfits. He remains part of the chaotic dynamics of the island as plans unfold.

A giant uninvited rampaging force that intrudes onto the island, threatening both human and monster residents alike. It wreaks havoc and forces the survivors to adapt their plans.