List of Code Lyoko: Evolution episodes

Enjoying their normal lives, Jeremie Belpois, Ulrich Stern, Odd Della Robbia, Yumi Ishiyama and Aelita Schaeffer soon discover that there is trouble still brewing at Kadic Academy. Even worse, the five best friends discover that their old and greatest virtual enemy - the evil, sentient and autonomous artificial intelligence/multi-agent system XANA - is somehow back as a highly evolved and modified version of itself. In a side story Ulrich tries to tell Yumi how he has always really felt about her. However Yumi's platonic friendship with William plays on his doubts.

A new, highly intelligent and gifted teenage girl named Laura Gauthier tries to join the quintet at Kadic Academy. She humiliates Jeremie by correcting his mistakes on a complex exercise in class. Aelita suddenly is resentful and suspicious of this new girl, who seems to want to discover their secret.

Meanwhile, Jeremie informs his four friends that he has programmed a new vehicle that is made for travelling through the Cortex easily called the Megapod. Once on the Cortex, they are impressed by the new cruiser, which Yumi ends up driving. Unfortunately, Laura follows William to the factory and discovers the lab and Supercomputer, which she is very interested in. During a battle with several Krabes, Aelita, Odd and Ulrich are devirtualized, leaving Yumi trapped in the Megapod. With Laura's help, Jeremie fixes the bugged vehicle and Yumi is returned to Earth just before the Megapod falls into the Digital Sea.

William is yet again rejected by the group, but when he asks Yumi for her help on a project she happily agrees, much to Ulrich's disdain. The dislike between the two grows when XANA creates a spectre of William to attack Yumi, and the two almost have a fistfight in the gym.

Aelita is determined to discover if her father really is involved in XANA's miraculous and mysterious return. So she, Odd, Ulrich and William go to the Cortex, with Odd piloting the Megapod to help her, as Yumi has chosen to stay behind to set up a fundraising party in the gym, enlisting the aid of a shy boy named Remi. He tries to help but accidentally breaks the sound system. Meanwhile, in the heart of the Cortex, the walls start to go haywire and devirtualizes Odd and Ulrich, leaving William to save Aelita before he, too, is devirtualized. Back on Earth, they go to help Yumi with the boy, who has been possessed by XANA.

Samantha Suarez - Odd's former sweetheart and girlfriend - enrolls at Kadic, and the boy eagerly pursues her. At the same time, he is being pursued by a polymorphic specter, which XANA is able to create due to its new increase in strength and power. The others go to Lyoko to deactivate the tower but are all devirtualized by a giant wall of 121 Bloks. Odd destroys the wall using a scanner eyepiece programmed by Jeremie and deactivates the tower.

Jeremie tries to create a virus to destroy the Cortex, however it doesn't work and the group discusses what to do. They decide to bring Laura to the factory and Odd steals her tablet and runs, with Laura chasing after him. When she gets there the gang explains about XANA and the Cortex and that they need her help, which she accepts to give. She easily fixes the problem and they launch the virus and a return to the past. Laura forgets everything, but thanks to a few hidden commands in the virus, the code for the return to the past was altered to exclude Laura, causing Laura to start having memory flashbacks of her time in the lab. She follows the memories to the sewers. William (who was left on Earth) tries to stall her, but fails, and Laura ends up back at the lab.

Jeremie and Aelita program false source codes that will destroy any specter that tries to take them from a Lyoko Warrior, and tests it using Ulrich as a guinea pig. Ulrich is told to wait at school until he spots a specter and deliberately touch it to transfer the fake source codes to it to test if they work.

The gang return to the Cortex to get data on the mysterious Ninjas. Ulrich opts out of the mission because he has a karate competition to attend, and Jim won't let him skip it. The others don't fare well against the Ninjas until Ulrich arrives, offering them advice that Jim passed on to him; be unexpected. With the advice given by Ulrich, and a new-and-improved, unusually effective bo staff weapon programmed for Yumi, in addition to her Tessen fans, she manages to defeat the three Ninjas easily and gathers the data. In it they find a video clip of Professor Tyron addressing several humans dressed in ninja-like costumes.

Jeremie is woken up by the Superscan when it picks up two activated towers. He warns the others, and just as they're leaving Aelita receives a message from an unknown sender asking her to meet them in a nearby building. While she's thinking about it, Laura comes and asks why she's not in class, then realizes that the others are at the factory. Aelita tells her to go on ahead, which she happily does.

Aelita then goes to the meeting place and finds a blonde-haired woman there; her long-lost mother, Anthea. They share a warm mother-daughter embrace. Jeremie offers Laura the controls and goes to find Aelita, realizing her "mother" is actually a spectre, and tries to convince her of it. Aelita doesn't believe him and returns to the spectre.

A computer error causes the science test scores at Kadic to be messed up, as well as bugging up the rest of the computer system with it. Jeremie is alerted to an activated tower and he, Aelita, Odd, Ulrich and Laura go to the lab to check it out. Laura's dad is called to the school as a result of the marks mix-up and he calls her back to the principal's office. He expresses his doubt in her abilities and his wish for her to go to another school. Laura insists on staying, deciding to show him the Supercomputer as proof of what she can do.

It's Friday the 13th and Odd can't believe his luck - he's won the lottery! He tries to impress Samantha with this fact, but he doesn't manage to catch up to her in time. Jeremie discovers that the lottery wins are happening all over Europe, and realises that it must be XANA. The group minus Odd head to Lyoko to deactivate the tower in Sector Five, which they do successfully. They return home and Odd comes to the lab feeling gloomy about not actually winning the lottery and his situation with Samantha, having bought a thousand red roses to give to her thinking he truly had won the jackpot.

Jeremie then notices that XANA had used the tower as a diversion to attack the Skid with a virus while they weren't looking. Odd is the only one who can go in and must pilot the bugged-up Skid and try to counter the virus with little experience doing either. Laura is called in to help, but they don't make much progress. Jeremie then decides to send Laura into the Skid to help on site, and she becomes extremely excited about the idea. Aelita, however, quickly guides Odd through the steps and together they counter the virus just before Laura is about to be transferred. The Skid is returned to normal and Laura leaves, furious about not having to go to Lyoko after all.

The gang has planned a routine data gathering mission in the Cortex. However, Ulrich opts out of the mission when he finds out that Yumi wrote some negative things about him. While in the Cortex being attacked by Ninjas, Yumi can't stop thinking about Ulrich. She gets herself devirtualized on purpose just to go talk to him and work things out. The two soon reconcile.

A tower is activated and a spectre is sent after Odd, taking the appearance of a football player. Aelita and Ulrich go to deactivate the tower, but when they reach it, Aelita is unable to enter. The tower deactivated itself because Odd lost the last of his source codes to the spectre.

Odd then formulates a protection plan where the "codeless" protect the people who can't return to Lyoko for 12 hours, and who have nowhere to hide from XANA's spectres. Another tower is activated and Ulrich and Aelita are shut in a closet under Odd's protection while William and Yumi are sent to Lyoko. William seems upset about being referred to as "codeless," as it means he can't deactivate towers, and isn't considered as important as the others. When he and Yumi reach the tower they're confronted by an evil clone of William who plays on his doubts, telling him that he's being used by the gang, especially Yumi. He and the clone then chase after Yumi while the footballer spectre finds Ulrich and Aelita and corners them.

Towers are being activated and deactivated constantly. Laura follows the group and Jeremie allows her to help, seeing as it's an unusual case. While in the lab she asks Aelita about Franz Hopper. Not getting a decent answer, she goes to do research in the library before confronting Aelita, saying that she knows Franz built the Supercomputer, and that he apparently abandoned his daughter. Aelita replies that her father didn't abandon her, but selflessly sacrificed himself for her, and asked Laura if her own father would do the same for her. Aelita returns to the lab.

A man named Graven shows up at Kadic asking after Jeremie, the smartest kid in school, offering him a place in a special scientific institution specialising in quantum physics. Jeremie denies having any knowledge of the subject, then figures out that Graven is an agent sent by Tyron, and that they must have traced Lyoko's location on Earth somehow. Graven gives up on Jeremie and moves on to Laura, the second smartest in the school.

Aelita sends the others to Sector Five to search for any kind of tracking device that the Ninja from episode 14, Intrusion, could have planted while it was on Lyoko. They find it but don't manage to destroy it, as when it's damaged it sends out an electromagnetic pulse that causes the Lyoko Warriors pain. They decide to dispose of it in the Cortex, carefully removing it from the bottom of the platform and taking it to the Replika in the Skid. XANA retaliates in the Digital Sea by sending Kongres, but they manage to make it there.

Aelita dreams of her long-lost mother, Anthea. She wakes up and goes to see Jeremie, but finds Laura there with him, both working on the virus to destroy the Cortex. A hurt Aelita leaves, and Laura smugly denies that there was anyone at the door. Jeremie and Laura finish the virus and the group plans to implement it that afternoon, but Odd gets detention and Ulrich sprains his ankle, forcing both of them to opt out. William, Aelita and Yumi go in.

Thanks to Odd, Jeremie comes up with the idea of getting source codes back from specters, thus reducing and weakening XANA's strength and power greatly. The plan works, and they trap a specter, but things go horribly wrong when it ends up on Lyoko in the form of blackish-green particles, severely damaging and disabling the scanners and putting the Lyoko Warriors it touches into a coma-like state with black and green eyes.

Jeremie can't bring the others back or even send William to help because of the damage to the scanners. The specter then tries to throw Yumi into the Digital Sea. Odd enters the Desert Way Tower and Jeremie uploads the codes they stole from the spectre into him. Odd races to the activated tower with the spectre in hot pursuit. He enters the tower and reaches the floating panel, but the spectre then enters the tower after him. Odd deactivates the tower moments before the spectre touches him.

Jeremie manages to develop a program that will allow the gang to hack Tyron's surveillance system and spy on him, both using video and sound, and potentially speak to Anthea. When the gang go to the Cortex to implement it, all but Aelita are devirtualized by Ninjas when they tip off an unforeseen security system. Aelita opts to stay in the Cortex's core to wait for her mother to appear, asking for a clone to replace her at the school while she's gone, which causes enough problems of its own.

Laura and Jeremie finally finish their virus. Laura is keen to implement it immediately and destroy both the Cortex and XANA, but Jeremie insists they wait until Aelita has made more progress with her mother, Anthea. Meanwhile William has another argument with Ulrich. Laura takes the opportunity to try and recruit William for her cause, and after some persuading he hesitantly agrees.

It's Aelita's "birthday" and someone is trying to hack into the supercomputer. The firewalls Jeremie created manage to stop it from getting in. When analyzing the data packet sent, Jeremie notices that it is of unusual design: created by Franz Hopper. Perhaps Anthea is trying to contact them to wish her daughter a happy birthday. Jeremie calls the others but does not alert Aelita, as he wants it to be a surprise.

During a training mission on the Cortex, the Megapod bugs up and Jeremie is forced to figure out how to repair it. Just as he does so, the superscan finds an activated tower on the Cortex. But when they arrive on site, they find the tower has a purple halo. It has been activated by Tyron, and the Lyoko Warriors are soon surrounded by Ninjas, and Odd, Aelita and Ulrich become trapped in a temporal bubble that sends them back to that morning's gym class, repeating it dozens of times over. They must find a way to contact Jeremie to tell them what happened so that he can destroy the bubble before Tyron uses its signal to track their location on Earth.

A mission to gather more information on Aelita's long-lost mother, Anthea, is cancelled when XANA launches another attack in the Mountain Sector. Unable to warn Odd and Ulrich, the two boys become the targets of XANA's attacks. Caught in the trap, Odd loses all of his codes once again. Meanwhile Aelita and Yumi are pinned in the Cortex by XANA's forces on route to deactivate the tower, and Yumi is later devirtualized.

On Earth, XANA has stolen Ulrich's codes as well. Realizing that Yumi is on Earth too, XANA sends the specter to find and recover the codes. After locating Ulrich and coordinating with Odd, Odd is sent to provide William and Aelita with backup while Ulrich locates and escorts Yumi to the factory. After arguing with Jeremie over Yumi's safety, William devirtualizes himself in order to find her. Odd goes to Lyoko while Aelita is being perused by Kongres in the Digital Sea. After Ulrich calls Yumi to find where she is, she's spotted by the specter. William and Ulrich team up to go look for Yumi, but split up after finding her phone, but not her. While in Lyoko, Odd is pinned down and out of ammunition, the Bloks are pushing him towards the Digital Sea. Aelita shows up in the Skid and destroys all the monsters.

Our heroes are on the Cortex to inject Tyron's supercomputer with their virus. This should be their ultimate mission that will allow them to annihilate XANA once and for all. But it turns out to be a failure. They must wait twelve hours to be virtualized again, return to the Cortex and finish their mission. Only, an unpredictable event happens. Tyron goes to the school and proves himself to be the legal guardian of Aelita: he and Anthea have been married for four years. He gives her a terrible choice: find her mother again or infect his supercomputer. Much to Tyron's surprise, Aelita chooses the latter, convinced that her mother would agree with her on eliminating XANA. Seeing things heading beyond his control and wanting to avoid the destruction of his supercomputer by a virus at all costs, Tyron ultimately decides to shut it down. Odd, William, Ulrich and Aelita, who were already on the inside, risk being thrown into the Digital Sea forever. Our heroes get out of it just in time and turn their own supercomputer off, merely neutralizing XANA once again, not destroying it.