While Will is trying to find it, Nerissa convinces it to take Will's place, and a battle erupts. The other girls try to help, but they can't tell which Will is the real Will, even in guardian form. The Altermere becomes good and is destroyed by Nerissa. Will convinces the Altemere to be absorbed into Will.
In the B-story, Will is forced by her mother to do laundry instead of help set up Mrs. Rudolph's good-bye party.
- This episode introduces the concept of Altermeres.
- This is the second time the Guardians see Nerissa.