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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 Season 1. In some countries, this prequel was known as "episode 0". In these two episodes, it is revealed how the 5 main characters met and became friends. You can click on the following pages to see more information about these two episodes: