Code Lyoko

X.A.N.A. possesses a rat that tries to sneak a bite from the school's kitchen. His creation goes on biting other rats, putting them under his control. Meanwhile, the school counselor has been watching Jeremie and believes him to be a gifted student. As such, he believes that Jeremie would be better off at a more advanced school and decides to give him an aptitude test. During the test, X.A.N.A.'s rat army attacks the school.