This episode starts out as Yumi and Aelita are running inside Lyoko looking for the activated tower. Then Yumi suddenly disappears! She comes out of Lyoko exhausted, and looks just fine! Until Yumi Comes into Jeremy's room and takes off Jeremy's glasses and deeply gazes into his eyes and Odd and Urick come in the room and they are shocked. Then Jeremy realizes that Yumi is being controlled by Xana! Then Odd, Ulrich and supposedly Yumi.... get digitized. Yumi breaks out and trys to destroy the factory. Until they find the ""real"" Yumi in an orb and then they destroy the bad Yumi and the show ends.
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