Malice uses his new doom ray to freeze the monsters around the city, but there's big trouble in store. The monsters have been eating a strange orange bacteria, and without the monsters to keep it in check, the bacteria spreads across the city. It infects food with too much sugar or fat- in other words, junk food. It changes burgers into people-eating mac-monsters. With the help of the children's entertainer Frothy the Bear, the kids have to unfreeze the monsters and defeat the rabid junk food before supper time.