Episode Overview
Title: The Trap Plot: On the anniversary of their first encounter with Aelita, Jeremie and his friends plan a surprise for her, oblivious to Sissi's eavesdropping. When Jeremie and Odd attempt to use the lab elevator, it malfunctions, prompting them to investigate in the control room where XANA launches an attack using the equipment. They manage to escape to the lab basement. Meanwhile, Ulrich and Yumi reach the elevator, which finally opens, but Sissi unexpectedly joins them just as XANA makes the lift drop. Yumi rushes to assist Jeremie and Odd. In the elevator, water begins to fill the space, and Ulrich vows to treat Sissi better if they survive. Aelita successfully inputs Code Lyoko, reversing time just before the water engulfs them. In the end, Jeremie and the team celebrate Aelita with an anniversary cake, and Ulrich honors his promise to Sissi.