|Air date||April 5, 2013|
|Written by|| Josep Maria Roca Peña|
Translation to Kadic
The episode begins on a Saturday morning (8 days after the previous episode). Odd wakes Ulrich congratulating his birthday. They down to the cafeteria room. There Ulrich expect a warm welcome from friends congratulating him. Yumi isn't with them but Odd tells him she's coming.
Then Jeremy, Aelita, Odd and Sissi's clone go to the rec room, where Jim gives the clone tasks of the room (at the end of "Wreck Room" Sissi was chosen instructor), and the clone says more nonsense. Ulrich and Yumi are spending the morning fighting a Pencak Silat competition.
Later, in his room, Jeremy detects an activated tower in ice sector and he alerts the other. The Lyoko-Warriors are heading to the Factory and Jeremy virtualizes them. When Ulrich's scanner closes, a X.A.N.A.'s spectre enters it. The supercomputer detects a virus in Ulrich's virtualization and Ulrich appears in Lyoko possessed by X.A.N.A. At that time X.A.N.A. deactivates the tower.
Odd fights with him. Two Bloks and two Hornets appear, and X.A.N.A.-Sissi fights against Odd while X.A.N.A.-Ulrich walks to the Digital Sea. Jeremy realizes that X.A.N.A. wants to be with him, as did with Sissi and warns his friends.
The genius tries to restart the supercomputer but X.A.N.A. has blocked the program. Yumi goes for devirtualize X.A.N.A.-Ulrch, but their fans are disintegrated ny X.A.N.A.-Sissi. She devirtualizes Yumi easily after defeated Odd.
Aelita is alone. X.A.N.A.-Sissi approaches it in her pink spirit and when she's going to attack her with the sword, Aelita dodges the attack and she can throw to X.A.N.A.-Ulrich an energy field that devirtualizes him. X.A.N.A.-Sissi devirtualizes Aelita laments defeat and jumps into the Digital Sea.
In the factory, Lyoko-Warriors are talking about X.A.N.A. can possess any of them but Jeremy says that the virus may not attempt because it has lost a polymorphic spectre and it will take more energy to create another.
Back at Kadic, Ulrich has a surprise: his parents have gone to the academy to congratulate him. Jim decides that Sissi won't be instructor anymore after what happened, and will now be Ulrich. His parents give him congratulations, and his father, Walter Stern, reminds him to study more.