Mad Monster Party?

In this campy stop-motion animated musical comedy film, Dr. Frankenstein calls an international roster of monsters to his creepy convention on the Isle of Evil in the Caribbean Sea, where he reveals his secret of total destruction and announces his imminent retirement as head of the Worldwide Organization of Monsters. The guests include a motley crew of classic monsters, each with their own unique personality and quirks, all vying for control of the formula that could change everything - or get them killed by the infamous "It". As the monsters plot and scheme, Felix Flanken, a bumbling but lovable pharmacist, stumbles into the fray, threatening to upend Frankenstein's plans and possibly winning the heart of his beautiful assistant Francesca.