Episode Overview
During the school health check-ups, Xana takes control of the nurse, Yolande, and has her abduct Aelita. The rest of the team arrives at the factory first but finds themselves unable to rescue Aelita from the much stronger nurse. Faced with this dilemma, Jeremie decides to try an experiment that will grant someone the powers that Xana possesses. This requires him to activate a tower, which will glow green instead of the usual red. Odd steps up as a volunteer and receives enhancements from a ghost designed by Jeremie, enabling him to battle the nurse while the others work on deactivating the tower. Unfortunately, this advantage is short-lived as Xana seizes control of Jeremie's tower, reversing the ghost's effect and draining Odd's energy. Meanwhile, on Lyoko, Xana makes everything invisible, forcing the group to deactivate both the original tower and the one that's sapping Odd's strength.