While reading an Underworld comic book, Billy finds an advertisement for "Chocolate Sailors", a delicious chocolate candy. Billy then becomes a seller of Chocolate Sailors, but ends up eating them all by himself. The enchanted candies turn him into solid chocolate, and now Billy can't stop eating himself. Then, Billy, Mandy and Grim go searching for the Chocolate Sailor to retrieve the antidote before Billy eats himself completely. In the end, Billy eats the antidote along with other enchanted chocolates and, his head (it was all that was left of him) explodes as a result.