After having a run in with a young girl named Bridget Verdant, Zoey overhears that the spirit of a drowned girl is haunting Excalibur High, causing strange things to happen to the water in the walls and to the pool. Corina thinks they should investigate to make sure its not a Predasite. But Zoey's far to scared to go. Who or what is behind the hoax?
- The third main protagonist, Bridget Verdant, is introduced in this episode. She is the third Mew to join the Mew Project.
- The episode title is a pun of combining the words "Pool" and "Poltergeist", since the episode is about a rumored ghost girl attacking people from a school swimming pool.
- This episode marks the first appearance of the combat castanets and its accompanying attacks "Deep Sea Surge Attack" and "Tidalwave Rush".