Code Lyoko: Season 1

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 posses

Principal Delmas lets Odd begin casting for a traditional rock band called the Pop Rock Progressives. They need a drummer, and several try out for the position, including Nicolas. Nicolas turns out to be the best, but Odd does not want anything to do with him. Meanwhile, XANA tries to overload a nuclear power plant by storing electricity in a transformer and unleashing it on the plant all at once, possibly causing a nuclear meltdown. Unsure if they can stop such an event, the group votes, and, b

After Jeremy and Ulrich paint graffiti portraying Jim in a less than favorable light on a wall in order for Jeremy to remain at school during a vacation, Sissi overhears him talking with the others about his reasons for doing so: to watch XANA. She gets her father to let her stay there during the vacation so she can discover the group's secret. XANA takes the opportunity to possess several barrels full of poison and turns the poison into a deadly, living gas. When Jeremy finds out, he calls his

When Sissi finds and steals Ulrich's diary, he is blackmailed into being her boyfriend. During a trip to a swimming pool, Jeremy and Yumi have the opportunity to find it. The new electric bus that is being used for the field trip is possessed by XANA. and starts acting weird as a result. Yumi ends up finding Sissi's diary during this and uses it to blackmail her into giving up the location of Ulrich's diary. XANA then turns the bus on the city's petrochemical plant, threatening to blow up a siza

The day starts off when two girls are talking about Ulrich and then Sissi goes and interrupts and tells the girls that Ulrich is hiding his affections for her. Later, Odd, and Ulrich pull a prank on Sissi, giving her a txt message about a ""true love"". While the prank is being set, people in the town are experiencing difficulties due to a strange virus, now 2 trains are going on a collision course and one of the trains has highly toxic chemicals which can kill the town's population. Yumi canno

Due to a favorable accident on Odd's part, Jeremy's materialization program for Aelita is finished, but is only good for one use. In turn, XANA possesses two bulldozers and sets them on the factory to prevent Aelita's materialization from taking place. Odd goes to Lyoko while Ulrich tries to stop the bulldozers. Ulrich is then knocked unconscious, and Yumi carries him to safety. Odd is devirtualized, and Yumi goes to Lyoko to help Aelita. When trying to stop an attack, Yumi pushes a Megatank to

After an unexplained incident on Lyoko ends up devirtualizing Yumi without any cause, she is taken to the infirmary. After waking up, she attacks the nurse, Yolanda (addressed as "Dorothy" in the English dub), and continues to act strangely throughout the day, wanting to go to Lyoko with everyone else. Jeremy will not let them, though, because he wants to know what caused her devirtualization. Meanwhile, on Lyoko, Aelita finds several Kankrelats guarding an orange sphere, which she calls a Guard

After Principal Delmas shows a movie about aliens made by a director named James Finson, Finson announces that he plans to make a movie in the city, using the factory as their primary location. The group would rather not have people setting up shop in their factory, so Ulrich tries to convince Finson that making a movie there would be a bad idea. All his efforts achieve the latter result, and he's even given a part in the movie, but Delmas will not let him miss school. Sissi, who wants to be in

During class, everyone's cell phones suddenly go off, and all of them are confiscated. Sissi is not happy about this and organizes a protest in response. Yumi joins the protest, since having cell phones is a necessary part of the group's fight against XANA. Meanwhile, Jeremy investigates the strange occurrence and learns that XANA is using the school's antenna to take over the nearby television antenna. From there, he could take over a laser-equipped, military satellite. While Odd and Ulrich hea

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 t

XANA possesses a rat that tries to sneak a bite from the school's kitchen. His creation goes on biting other rats, putting them under his control. Meanwhile, the school counselor has been watching Jeremy and believes him to be a gifted student. As such, he believes that Jeremy would be better off at a more advanced school and decides to give him an aptitude test. During the test, XANA's rat army attacks the school.

After failing with an army of rats, XANA attempts a similar tactic using hornets. Meanwhile, Ulrich gets a letter from Yumi saying that she loves him. He's not quite sure how to respond, so he avoids talking to her about it. Jeremy and Odd find out about the note, but does not learn who wrote it. Ulrich tells them not to tell Yumi. After learning about the hornets and XANA's control over them, the group heads for the factory. Ulrich talks to Yumi about the note and tells her that he feels the sa

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 ge

It's been a year since the group first discovered the Supercomputer and Aelita, and they decide to throw a surprise party for Aelita. Sissi catches wind of the party and follows Ulrich and Yumi to the factory. On the way there, XANA possesses the factory as a whole. Jeremy and Odd are the first to arrive at the factory, finding the elevator to be inoperable. They head off to find the fuse box. Once Ulrich and Yumi arrive there, Sissi confronts them about it. They tell her to leave, but XANA's ea

In class, Susan teaches the class about nitrous oxide, more commonly known as laughing gas, and its effects. Meanwhile, Yumi's parents are having trouble with their relationship, which Yumi is not too happy about. No one seems to be able to cheer her up, even Ulrich. He eventually manages to do so, however, and helps her find a way to bring her parents back together. During a school production of Romeo and Juliet, XANA possesses the laughing gas in the science room and uses it to attack Odd, who

After a quick game of soccer, Yumi heads home for the night, but Odd and Ulrich head in for dinner, and Jeremie is already there. He decides to check on Aelita, and Yumi ends up following him instead. But, while scarfing the desserts the others left behind, he and Ulrich get caught up in a shocking Xana trap. Not only is the lunchroom electrified, the roof may fall in at any time. Even the combined power of the eight kids trapped inside - including Odd, Ulrich, and Sissy - can only delay Xan

When Suzanne gives a lesson on nanotechnology, she uses a small machine designed to produce the little robots as an example. Little do they realize that XANA has infected the machine, so when they find it filled with gel, Odd carelessly ends up pushing Ulrich's face into a small scoop of it. Later on, Ulrich gets a headache and faints. When he wakes up, his memory is gone. Sissi is there at the time, so she uses Ulrich's memory loss to convince him that she's his girlfriend. As the rest of the g

A new rock song Odd downloads sends him into a coma, and the same song is passed through the school. XANA's new beat is the cause, and he can broadcast it anywhere. The hospital is full to bursting with cases, and Odd's heart gets weaker with every beat it makes. But when the tune starts playing in the factory, will the crew learn that music can do more than just soothe the soul? And, will Aelita be able to save the crew? It's all up to a leap of faith...

When Jeremy yells at Aelita, he tries to go to Lyoko to apologize. Unfortunately, while Yumi is transferring him, she makes a scanner error, which leaves him trapped in a virtual limbo between Lyoko and the real world, so Aelita has to retrieve data to recover Jeremy without support in order to bring Jeremy back, but when she gets to the Mountain Sector, there are a couple of Bloks guarding the tower. Yumi is sent to retrieve Jeremy's laptop to virtualize Ulrich, but gets caught and ends up in t

Both Herb & Jeremy are in a robot competition Herb with ""Iron Sissy"", and Jeremy with ""Kiwi 2."" Herb cheats by launching a gear from Sissy to destroy ""Kiwi 2."" Meanwhile, Xana's latest plan, using the factory to built a robot. Ulrich & Yumi get help from Herb in slow down Xana's robot. Jeremy discover that Xana robot had built in the factory and messed with computer that goes to Lyoko. Jeremy fixes the super computer, and Odd helps out Alieta in Lyoko. After the time reboot, Kiwi 2 do

Xana decided to get rid of everyone by using the power of Gravity, and Yumi, Odd, and Jeremy went to the factory, but Ulrich had a soccer game, and his Dad was there, and as Odd said: If you're not first, then you're not good in his book. Ulrich had to save Mrs. Hertz though, because she was in the science lab. So Yumi and Odd went to Lyoko, but a huge swarm of monsters reached them, and Yumi and Odd had to clear a path for Aelita, and Yumi created a rock shield with her Telekenesis, but Yumi's

After many XANA attacks in a row, Ulrich starts to get tired of fighting XANA. On top of that, he questions his relationship with Yumi and if she feels the same way about him. He begins to hang around a girl named Emily, and Yumi gets jealous, causing a great fight between the group. When XANA activates a tower without disturbing Earth, Jeremy forces Ulrich, Odd, and Yumi all to go to Lyoko to deactivate the tower. After being virtualized, a virus infection occurs on Lyoko because XANA sabotages

Well, it starts off as Yumi wanting to have a party at her house. Of course, Odd jumps into action, and says that he has the Deejay problem all solved, they weren't going to listen to Sissy's music. But, oddly, Jeremy couldn't get a connection with Lyoko. Later, Odd and Ulrich are having sliding contests across the floor, but soon, a picture of the Deejay Odd was getting fell on the floor. Ulrich and Jeremy saw is and they asked who it was. Odd said it wasn't important, and he had some stuff to

One day at school, Jeremy notices that Odd, Ulrich, and Yumi are missing. Meanwhile, Odd, Ulrich, and Yumi ARE at school with Jeremy! What's going on? Turns out that XANA (in the form of Jeremy) has trapped Odd, Ulrich, and Yumi in a virtual world identical to the boarding school, completely at his mercy. With Aelita's help, Jeremy reaches the fake school and tries to convince his friends that he is the real Jeremy and that the imposter is XANA. When they learn that Jeremy got into the scanner t

Jeremy finally completes his materialization program and prepares to bring Aelita into the real world. At the same time, Jim's suspicions of the group have risen to the point that he's actively trying to discover their secret and he ends up causing Jeremy to injure his ankle while running away from him downstairs in the school. In the infirmary, Jeremy overhears that the principal's going to have to fire Jim, so he tells Jim to help him get to the factory, and in return, Jeremy will tell the pri

Aelita is materialized, but unfortunately, Xana implanted a virus inside of Aelita, so if Xana dies, so does Aelita. Then Xana decides to attack with bringing his own monsters to Earth. Ulrich and Yumi fight off the monsters, while Odd goes to Lyoko with Aelita. Odd eventually get materialized himself, but luckily, Ulrich and Yumi reach the factory, and fight off the last Hornet, attacking Aelita. She deactivates the Tower, and on the second run, the gang is talking with Aelita, about finding an