X.A.N.A. William
Code lyokoWilliam
First appearance Final Round
Also known as William, X.A.N.A.
Physical information
Hair color Black
Eye color Black (Grey in Evolution)
Height 1.7m (5'7)
Weight 57kg (125.7lbs)
Virtual information
Weapon Zweihänder
Powers Super Smoke
Tower Control
Second View
Played by French Voice: Diego Mestanza

X.A.N.A. William is a character when William is possessed by X.A.N.A.. In the show, X.A.N.A.-fied characters were simply referred to by character names. However, the "X.A.N.A." prefix is customary among fans. X.A.N.A. William is a secondary antagonist in season 4. X.A.N.A. William's first appearance was in Final Round.


Season Three


William falls even deeper in X.A.N.A.'s power after disintegrating Lyoko.

X.A.N.A. William was created in Final Round when William was attacked and possessed by the Scyphozoa. X.A.N.A. William, after being released by the Scyphozoa, uses his Zweihänder to launch an energy slash at Aelita, devirtualizing her in a single hit and then runs off towards the Core of Lyoko. X.A.N.A. William devirtualizes Odd using his energy slash from quite a distance as Odd is climbing up towards the Core, then Ulrich is stabbed in the back as he turns around to look at his Katana that was flung behind him by X.A.N.A. William's energy slash. He soon devirtualizes Yumi by using his Super-sprint ability to run up behind her and stabbing her in the back where she says that they shouldn't have trusted him while being devirtualized. After defeating the warriors, X.A.N.A. William uses his Zweihänder to destroy the core of Lyoko, which in turn destroys Lyoko and seemingly destroys the real William along with it. 

Season Four

William possessed

X.A.N.A. William in William Returns.

X.A.N.A. William appears in the episode William Returns, where X.A.N.A. William impersonates William and claims to not remember being X.A.N.A.'s slave or how he escaped the Digital Sea. He later appears in Aelita's dorm room and rescues Aelita from Sissi's constant questioning. Afterwards he reveals that he is under X.A.N.A.'s control and kidnaps Aelita and takes her to the Factory. At the factory, he virtualizes himself and Aelita into Lyoko. Once there, Aelita temporarily is able to escape from X.A.N.A. William, but he recaptures her by using his Super Smoke ability to knock her unconscious. Once he reaches Celestial Dome he calls for a black Manta in order to transport himself and Aelita to the outer side of Sector 5.

Not soon after, X.A.N.A. William is pursued by Ulrich and Yumi on their own vehicles; however, Ulrich is devirtualized by the black Manta's Flying Mine, leaving Yumi left to chase William. X.A.N.A. William and Yumi make their way outside Sector 5, only to have nothing around them but the Digital Sea. Once outside, X.A.N.A. William fires an energy wave from his sword, making Yumi fall from her Overwing. But she is safely devirtualized by Odd's Laser Arrows before falling into the Digital Void. Odd is now in hot pursuit and fires more Laser Arrows at the manta, forcing X.A.N.A. William to throw Aelita off the manta and into the sea. Aelita is quickly rescued by Odd on his Overboard, however. Odd then destroys X.A.N.A. William's manta causing him to have no choice but to dive into the Digital Sea.

X.A.N.A. William practically serves as a lieutenant for X.A.N.A. during Season 4. It uses his strength against the Lyoko Warriors and includes him in its plans very often. In Cold Sweat, the group manages to free William using the data that they gathered from the Tower that X.A.N.A. used to translate him onto its Replika's facility.

Season Five (Code Lyoko: Evolution)

In Mutiny, Laura sends William to the Cortex alone to try and insert a virus that would destroy X.A.N.A. (though in the process would loose contact with Aelita's mother). This wasn't a legal mission. While on the Cortex, William accidentally runs into the Scyphozoa. He tries to escape by devirtualizing himself but he is captured and possessed again before he has the chance. However, the Scyphozoa has not managed a full possession, William is being held up above the ground by its tentacles, surrounded by a black aura. He raises his hand and a digital sound comes from his mouth, commanding the Krabs.

The three Lyoko Warriors can't do anything against the massive army of monsters, and they take shelter behind the Megapod. They decide that talking to William and trying to wake him up is the best course of action, acting as a distraction so someone else can get closer to the Scyphozoa and sever the mental connection between it and William. Ulrich fights William, constantly goading him to try and remind him of their romantic rivalry and his life on Earth. It seems to work, as William slowly becomes more and more human-like again, eventually allowing the Scyphozoa to be cut off. His black aura disappears and William returns to normal, thanking the others for saving him from X.A.N.A.'s crutches again.


Season Three

Season Four

Season Five


X.A.N.A. William, like all of X.A.N.A.'s minions, is fierce, hostile, and carries out orders without question. He is incredibly overconfident when in battle against the Warriors, which is partially why he is usually defeated most of the time. X.A.N.A. William generally likes to target Yumi when fighting the Warriors. Unlike the normal William, he rarely talks, although on occasion he will shout commands at X.A.N.A.'s monsters or when he's fighting the Warriors. When he does talk, his voice is deeper than William's.

Powers and abilities

X.A.N.A. William has all the same powers as William does. X.A.N.A. William wields a darker version of the Zweihänder, which X.A.N.A. made much lighter as evident by the fact that X.A.N.A. William can freely swing the sword or hold it with one hand. The sword can also fire deadly energy waves when it is swung. 


  • Super Smoke: An ability much like Ulrich's Super Sprint, but instead of simply running at speed, X.A.N.A. William becomes smoke to pass away from people, monsters or things. The black smoke can suspend other people in a paralyzed state. Super Smoke is known to be much faster than Ulrich's Super Sprint.
  • Second View: The ability to see much farther away in a sector.
  • Levitation: An ability that allows him to levitate by holding his Zweihänder by both hands and pointing downward. 
  • Tower Control: Ability to activate a tower for X.A.N.A, from the inside or outside. This mimics Aelita's and it is possible X.A.N.A allowed him to use a version of the Annex Program.
  • Monster Riding: Ability to ride monsters on Lyoko.


  • Black Manta - A unique Manta for William to ride on as a vehicle.
  • Rorkal - A virtual ship like a Nav Skid created for William, but he was given a black, independent one by X.A.N.A, who made it by using the data he had stolen from the Skidbladnir through the Scyphozoa in The Lake.



>> More images of X.A.N.A. William in Season 3

>> More images of X.A.N.A. William in Season 4


Code Lyoko Social Game

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