Two children sneak downstairs on Christmas Eve, classically hoping to catch a glimpse of Santa Claus delivering their presents. Instead, they find a ghastly monster devouring Santa’s milk and cookies. When the monster turns to confront them, both are frozen in fear as they expect to share the cookies’ fate. Instead, the monster judges both of them as "good", and literally barfs up a present for each of them. Challenging them both to “stay good”, the monster retreats up the chimney, and upon opening his present, the boy discovers it is exactly what he wanted.