[3] Marshall (Mario Yedidia) is a monster movie-obsessed preteen, and he's not crazy about his divorced mom's boyfriend Ted (Bill Fagerbakke), because he misses his dad.

Upon finding out that the mummy has "escaped" from the coffin, he orders his henchmen to look for it and bring it back in time, as he is selling it to an interested buyer.

As the Halloween deadline draws closer, the children also discover that in his previous life, Harold was in love, and wishes to be reunited with his lover.

Harold is captured, and his friends get Bruce to help them in their rescue plan (using some creative Halloween props, and Gilbert making both a dangerous and daring attempt by driving a car through a wall).

After several incidents, the group finally figures out how to work together, foiling the plans of Mr. Kubat, as well as bringing Harold and his beloved back together before they return to their rest peacefully.