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 too cocky and ended up being possessed by the Scyphozoa. X.A.N.A. William is released by the Scyphozoa and then dropped on the ground, having his mind and body taken over by X.A.N.A. and he turns to Aelita to overwhelm her in terror with his Zweihänder to block every attack and let out a wide, energy slash at, which devirtualizing her and once done, he shouts in glory of his kill. X.A.N.A. William heads to the Core of Lyoko to prepare to peel it open, for the end of the world. By being distracted by his old team, X.A.N.A. William gets ready to snuff them out, he first devirtualizes Odd with the same slash, using more precise accuracy and second sneaks up when Ulrich is left un-guarded and stabs him, and he lastly reacts faster, sneak attacking Yumi with a Super-sprint ability, devirtualizing her as well and having her doubt in her mind that he shouldn't have gone with the ground. With the warriors out of the way, X.A.N.A. William takes his chance and uses his Zweihänder to destroy the core of Lyoko, the digital world is gone and with all the last remaining energy, it goes into William and with a special process, his biological and avatar code is altered, thus having his body permanently marked with X.A.N.A. Also, in the lost of hope, the team gets a message from the internet so they may re-create Lyoko.

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 steps out of the Scanner and disguises himself as the real William where he claims that he didn't recall about being X.A.N.A.'s slave or how he had escaped the Digital Sea. When Sissi questions Aelita's personal life for a "Scoop" , the false William comes in to get her out. As soon as he is alone with her, William reveals that he is controlled by X.A.N.A. and makes her his "prisoner". When fully shown as X.A.N.A. with the dead stare and eyes, he gets an unconsious Aelita ready to go into Lyoko, and makes sure she is with him at all times, using his Super Smoke ability to keep her like it. When he succeeds and has her in his grasp, he makes it to the Celestial Dome and calls for a black Manta to get himself and Aelita to the outer side of Sector 5. X.A.N.A. William also takes precusion and keeps his boot on her, so she can't escape.

In a ride to Aelita's death, X.A.N.A. William is pursued by Ulrich and Yumi with their vehicles and the monster releases mines that do the same action back at them; Ulrich is devirtualized by the black Manta's Flying Mine and leaves out Yumi to deal with William, before Odd arrives from his Disco Training. X.A.N.A. William and Yumi make their way outside Sector 5, only to have the incomplete digital world showing the Digital Sea in the area. Once they are outside, X.A.N.A. William counterattacks Yumi more clever with an energy wave from his sword, having Yumi lose balance and fall off her Overwing. Odd's Laser Arrows save Yumi and now gets rid of 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, Aelita discovers data that can be used to free William from the Tower that X.A.N.A. used to translate him onto its Replika's facility, as it gives access to the programs X.A.N.A. uses to keep William under his control. In the next episode, Down to Earth, the group manages to free William from X.A.N.A.'s control, though at the cost of the Skidbladnir.

However, due to spending most of his time in the virtual world under X.A.N.A.'s control, as opposed to using the Scanners constantly as the other Lyoko Warriors did, X.A.N.A. is able to possess William once again in Fight to the Finish, whereupon he battles Yumi, and later Ulrich, in the Factory. When the X.A.N.A. Destruction Program is released, X.A.N.A. William emits a large amount of black smoke from his body, to signify X.A.N.A.'s apparent demise.

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


Due to William being possessed by X.A.N.A. he demonstrates every behavior his master does, such as willing to destroy the Supercomputer and the Lyoko Warriors, keep Aelita alive for his plans and do horrible things to the environment. In the real world, X.A.N.A. behaves just like his host does, only to reveal his true self when he is alone. In the digital world, X.A.N.A. has more freedom to control the towers, and will guide his minions so they don't end up failing (whereas on their own they can't react fast enough to attack). X.A.N.A. William also has total awareness of his master watching his every move (shown where he referred to X.A.N.A. when he won), but is in reality still it himself. In the new series, X.A.N.A. William was a seperate entity that still behaved like he did before, but also shown he was in need of fun with the real William, thus showing it is basically just X.A.N.A. in a body.

Powers and abilities

X.A.N.A. William has all the same powers as William does, and modified by X.A.N.A. He 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 virtual objects, monsters, and warriors. He can project black smoke onto others to suspend them 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 the virtual world.
  • Levitation: An ability that allows him to levitate by holding his Zweihänder by both hands and pointing downward. 
  • Tower Control: Ability to activate Towers for X.A.N.A. He can exert influence over protected Towers until they succumb with time, and access their interfaces from inside the Towers. This like Aelita's own Tower control abilities, 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. He can also command them to be lead against X.A.N.A.'s enemies.


  • 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

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.