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An unexplained incident on Lyoko ends up devirtualizing Yumi without any cause, she is taken to the infirmary. After waking up, she attacks Yolanda and continues to act weird wanting to go to Lyoko. Jeremie won't let them, cause he wants to know what caused her devirtualization. On Lyoko, Aelita finds several Roachters guarding an orange sphere-Guardian, and informs Jeremie.