Ash and the others arrive in a town where all of the children have been disappearing. The head to the pokemon center where all of a sudden their pokemon start acting sick. They team up with Officer Jenny and track the source of the strange energy to a rooftop mansion, where people are using a Drowzee as a sleep aid. When Misty tries it, she begins acting like a Seel and runs off into the nearby rooftop park. They then follow her to a giant pond where all the missing children are. They then decide to use Hypno to reduce the children's condition, but Team Rocket decide to get the psychic pokemon for themselves.