Shadow hunter Angela Dot is about to drive the magical Summer Shadow suit to a safe location, to make sure it will not cause any more trouble. But the shadow chest containing the suit falls off the truck and ends up at a schoolyard, in the middle of their Halloween celebration. The Summer Shadow steals the kids’ candy and freezes the principal and several teachers and students with its shadow slime. Sasha and Puck become heroes as they manage to capture the Summer Shadow and reveal who is hiding inside the suit.