It follows three mummies as they end up in present-day London and embark on a journey in search of an old ring belonging to the Royal Family, stolen by the ambitious archaeologist Lord Carnaby.
Tad accidentally unleashes an ancient spell, endangering the lives of his friends Mummy, Jeff, and Belzoni. With everyone against him and only helped by Sara, he sets off on an adventure to end the Curse of the Mummy.