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X.A.N.A. Awakens was the two-part prequel episode of Code Lyoko, followed by season 3. Chronologically, it takes place a few weeks before the events of Teddygozilla, the first episode of the season 1. In some countries this prequel was named "episode 0". These two episodes show how the characters met and became friends. You can click on the page of these two episodes to see more information: