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During one of Aelita and Yumi's routine missions on Lyoko, Yumi suddenly and inexplicably disappears and then reappears inside one of the scanners in the factory. As she is unconscious, Jeremie, Ulrich and Odd take her to the infirmary. When she wakes up, she starts acting strangely, insisting that they take her back to the factory. Her friends are still wondering how it is that she was sent back to the real world before it was time...

What the boys don't know is that the real Yumi is still on Lyoko, held prisoner by X.A.N.A, while an evil and almost indestructible clone has taken her place in the real world. The clone has but one mission: to destroy our heroes!

An unsuspecting Jeremy sends Odd and Ulrich to Lyoko to help Aelita deactivate a tower. In so doing, he ends up alone, face to face with the real X.A.N.A creature. Only the real Yumi, once she is freed by her friends and gets back to the real world, can face up to the clone at the last minute.

Jeremie Belpois, Ulrich Stern, Odd Della Robbia, Yumi Ishiyama, Aelita, X.A.N.A., Elisabeth "Sissi" Delmas, Dorothy, Mrs. Suzanne Hertz, Herb Pichon, Nicolas "Nick" Poliakoff, Jim Morales, Tamiya Diop, Milly Solovieff, Jean-Pierre Delmas, Kiwi

There are 52 episodes planned.

Air dates shown are for those in the U.S. on Cartoon Network. In fact, the series first aired on France 3 on September 3, 2003.