This is a list of episodes for the French animated television series Code Lyoko. The first season has no set viewing order except for the last two episodes, so the episodes are listed by the order in which they aired. The episodes in the following seasons are numbered in order. The series has a total of 97 episodes: 26 each for the first two seasons, 13 for the third, 30 for the fourth and the 2006 two-part prequel.
The MoonScoop Group announced a sequel series titled Code Lyoko: Evolution that ran for one season and consisted of 26 episodes. The series revolves around a gang of boarding-school students who travel to the virtual world of Lyoko, within a quantum supercomputer, to battle XANA, a malevolent AI/multi-agent system who desires to rule all of humanity.
Milly and Tamiya are doing a report on the school prom. They try to interview Sissi, who was prom queen last year, but she turns them down and makes fun of them for their age. Milly tries to ask Ulrich out, and he turns her down because he's going to the dance with Yumi. Upset, Milly storms off. In her room, she tells Tamiya that she hates everyone, with XANA listening from her computer. When Milly tells her teddy bear that she wishes she were bigger and leaves it in the garden shed, XANA possesses it and uses it to attack those who make fun of her. It then increases the teddy bear's size to roughly two stories and sets it on the town. Since Ulrich is to protect the school and warn Yumi, it is up to Odd to go to Lyoko and help Aelita deactivate the tower and protect the rest of the town from the rampaging teddy bear. After a return to the past, Milly asks Ulrich to the dance again, and Ulrich complies, embarrassing Sissi.
After Jeremy makes another failed attempt to materialize Aelita, a student named Taelia arrives at school that looks exactly like her. Jeremy is convinced that it must be her, but she seems to have no memory of her experiences with the group. The others are not quite as convinced, but Jeremy insists that the materialization process must have caused her to lose her memory, but the others were right. Aelita is still on Lyoko and captured by a Guardian. Meanwhile, XANA possesses the samurai armor that Yumi brought to school and uses it to chase Yumi. Jeremy brings Taelia with him to the factory. Odd and Ulrich must free Aelita and deactivate the tower before Yumi is defeated by the possessed samurai armor and Jeremy is taken away by the police.
Taking a different approach to his research, Jeremy materializes a single hair of Aelita's. Unfortunately, the follow-up test goes awry, and Jeremy has to find out why. Meanwhile, different parts of the school begin to crumble apart. Jeremy learns that his first test damaged Aelita's program, and she'll be deleted if she tries to deactivate a tower. On top of that, they learn that XANA is responsible for the damage being caused to the school by using ultrasonic sound waves, which continues to get worse. Jeremy has to fix the damage he caused in time to save Odd, who ends up trapped inside the school with Milly, Tamiya, and Kiwi. Unfortunately, after two tries, both ending in failure, Aelita, with the help of Yumi and Ulrich, has to deactivate the tower or else Odd, Milly, Tamiya, and Kiwi will be killed. After the return to the past, Yumi remembers that Jeremy said that the hair contained Aelita's entire computer code. Jeremy places the hair in the scanner, virtualizes it to Lyoko, and Aelita is inside the tower she deactivated.
This episode takes place one month after the events of the first season. After discovering Aelita's link to the Supercomputer and the inability to shut off the Supercomputer that stems from it, Jeremy works hard to find new and better ways to fight XANA. To that end, he develops new vehicles for the group. He also develops a new tower-scanning program that instantly detects activated towers, allowing Aelita to live on Earth. The group encounters a new monster in Lyoko, which Odd names a Tarantula. While adjusting to her new life, the class takes a trip to the nearby woods for a scientific field trip. Ulrich wants to partner up with Yumi, but she's already partnered up with someone named William. He comes from another school, having been expelled from it. During the field trip, Aelita and Jeremy partner up. Jeremy is forced to retrieve his laptop, leaving Aelita in the woods. With him gone, Aelita is frightened by visions of wolves, which lead her to a house known as the Hermitage. There, she has even more visions and is attacked by XANA. Once the others arrive to find her, they learn that XANA has possessed the house and uses everything in it to attack them. They find Aelita in a sauna in the basement. XANA tries to trap them all inside and boil them, but only succeeds in catching Ulrich and Yumi. Aelita and Odd head to the factory to shut down the tower before they are boiled alive.
When Ulrich tries to tell Yumi how he really feels after some prodding by the rest of the group, he finds her talking to William, who is doing the same thing Ulrich had planned to. Yumi turns him down, but Ulrich leaves before hearing it. Meanwhile, XANA activates a tower and materializes a Krab. At school, a driving class has been set up to teach the kids road safety. William turns out to be a good driver and Ulrich a rather poor one, which William makes fun of him for. The two then get into a fistfight, much to Yumi's annoyance. William and Ulrich both get detention because of the fight. Jeremy learns of the activated tower shortly after and the group heads to the factory without Ulrich.
In a prequel to "Teddygozilla", twelve-year-old Jeremy discovers a quantum supercomputer in an abandoned factory. Within, he finds that the computer runs a world parallel to Earth, a virtual world called Lyoko, along with an artificial intelligence Jeremy decides to name Maya. Jeremy tries to help Maya as much as he can with understanding what she is doing on Lyoko. With the Supercomputer active, strange events begin to plague Jeremy. He finds new friends he reveals the computer to. Additionally, Ulrich meets the mysterious but beautiful Yumi who beats him in a duel; much to his shock.
After another three-week vacation, the group is still looking for a way to fight XANA. XANA, meanwhile, is trying to destroy Lyoko, preventing them from doing just that. He does so by targeting the core, which contains the code that maintains the virtual world. In a side story, Odd blackmails Jim into asking Principal Delmas to make Odd have the same classes as his friends. Additionally, Yumi decides against having a relationship with Ulrich and decides it would be better if they were just friends. While defending the core, Aelita is suddenly devirtualized by the enemy. However, she still ends up back in the scanners and Jeremy realizes that this is because Aelita is fully human, just like the rest of the group, so she does not need Code: Earth anymore to be materialized on Earth.
In order to compensate for William, who is still under XANA's control, Jeremy sets to work designing brand-new virtual attire and digital "enhanced" weaponry and abilities for his friends and recreating the rest of Lyoko. In order to buy himself time to do this, he activates a tower and uses it to create a clone of his own to attend class in his place. Meanwhile, William's absence is drawing attention, from both the principal and his father. While Jeremy's clone is impressing Jim outside, William appears on Lyoko and tries to put the tower under his master's control. In order to maintain his clone, Jeremy draws more virtual strength from Sector 5 to maintain the activated tower. He eventually runs out of digital energy and the tower is put back under XANA's control. While Odd holds the Jeremy clone off, Aelita, Yumi, and Ulrich go to Lyoko with new outfits and somewhat much stronger abilities and slight improvements of their old weapons. They eventually deactivate the tower. William threatens to push Yumi into the Digital Sea, but before doing so he comes back to his senses. Yumi is saved from the fall by Odd at the last second. Jeremy then initiates a return to the past and creates a William clone to prevent any suspicion about his absence.
Jim's nephew, Chris, the drummer of the Subdigitals, pays a visit to Kadic to look for an opening act for the band's next concert. Everybody tries out, and Aelita turns out to be the one Chris is looking for. However, circumstances make sure that Chris does not realize who Aelita is, and XANA's clone of him only complicates matters, kidnapping Aelita and sending her to Lyoko.
The new virtual, submersible "submarine" (as Jeremy calls it) is almost complete, the last step being a secondary program that needs to be run by 4 PM the next day. However, when Aelita and Jeremy stay up late to set the program up, they are caught and given detention.
The gang manages to convince Jeremy to let them test out the Skid. During this test, the navigation system bugs up, leaving the gang stranded in the digital sea. Jeremy runs to his room to fetch the backup programs, but forgets that it's Fire Safety Day and runs into several teachers, eventually having to scale the roof to get to his room.
When a comet passes near Earth, XANA uses a laser-equipped military satellite to split it into chunks, simultaneously aiming the bulk of it directly at the factory. Aelita, Odd, and Ulrich are exploring the digital sea at the time, and XANA traps them with a firewall to prevent them from stopping the attack.
Jeremy, Aelita, Ulrich, and Odd go with the rest of their science class on a field trip to an island in the middle of a nearby lake to study water-based plant life. Yumi, not part of the class, remains behind to sit through two important exams. Jeremy's fears about XANA attacking at such an inopportune moment are realized when XANA creates an electricity-blasting sludge that attacks anyone who approaches the shore. Yumi is forced to go to Lyoko alone. She fights William and during their fight is able to reach his true mind and personality. Though XANA soon manages to regain control of William, Yumi is saved by Aelita, who escaped the island on Sissi's bike. Aelita is able to deactivate the tower and Yumi claims that one day they will bring William home. She initiates a return trip to the past and the class is saved from electrocution.
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