John is fed up with Michael copying him all the time. But when Michael wanders off alone, upset that his brother has rejected him, he is convinced by the Mermaids to drink some water from their lagoon. His soul immediately grows dark and he comes under the Mermaids' control. Will they manage to use him to turn everyone in Neverland, the pirates and the Lost Kids, to the dark side and take control of the island? And will Peter and John be able to save Wendy and Michael from the terrible fate awaiting them?