Code Lyoko

Season 1

TV-Y7

69%

After discovering a parallel universe hidden inside a supercomputer, four students must stop a renegade virus from destroying the secret world.

Where to Watch Season 1

26 Episodes

Teddygozilla
E1
TeddygozillaA student named Milly seeks the comfort of her teddy bear after being embarrassed and ostracized due to her young age by Sissi, the school's bully/diva. A corrupted super computer known as X.A.N.A. enters the real world by possessing the bear. In a quest to strike and destroy his enemies, the X.A.N.A infected teddy bear increases to an enormous size. No one is safe as this monstrosity creates a path of destruction.
Seeing Is Believing
E2
Seeing Is BelievingOdd decides to start a music band with his friends. But Jeremy can't play, so they try to hire a drummer. In the end, the best drummer they can find is Nicholas (Sissi's blond-haired crony). As the group argues over whether or not to let Nicholas join the band (Ulrich and Yumi: Pro-Nicholas. Odd: Anti-Nicholas, Pro-Naomi), Jeremie alerts them that XANA is planning to overload a pylon and send this massive electric current through the telephone wires to blow up a nuclear power plant. Just in the nick of time, Aelita, Ulrich, and Odd stop XANA's plan. At the end of the episode, Odd gives in and allows Nicholas to be the drummer of his rock band.
Holiday in the Fog
E3
Holiday in the FogTo keep an eye out for X.A.N.A., Jeremie decides to stay back at school for the vacation. Suspicious of the gang's secrets, Sissi decides to stay as well, milking the situation when X.A.N.A. launches toxic gases into the school, in an attempt to destroy his enemies.
Log Book
E4
Log BookSissi has found something very special and dear to Ulrich, his diary! Unfortunately the diary contains some information on X.A.N.A. and Lyoko. Sissi decides to use this as a means of blackmail to get with Ulrich. Later Odd, Ulrich, Sissi, and some of the other students are going to a pool, the bus that their riding in is X.A.N.A.'s next target. He wants to ram the bus into a chemical plant. Now the team must head to Lyoko to help Aelita get to the tower to save the students and the rest of the city.
Big Bug
E5
Big BugCrashing the city's communications device with a virus, X.A.N.A. jeopardizes thousands of citizens when he runs a pair of trains on a collision course, one of which contains dangerous chemicals. Meanwhile, Odd gets in trouble with the Kadic administration when Sissy reveals the existence of Kiwi to Jim.
Cruel Dilemma
E6
Cruel DilemmaJeremie is working on the materialization program, and finally gets it. Jeremie wants to matierialize Aelita, but realizes that preparations need to be made. That night, Xana possesses two bulldozers and starts to destroy the factory. Odd and Yumi go into Lyoko where she falls into a virtual black hole. In order to save Yumi's life, Jeremie has to choose between either materializing her or Aelita.
Image Problem
E7
Image ProblemYumi is held captive in Lyoko while her evil clone attempts to destroy the heroes. Meanwhile, an unsuspecting Jeremy sends Odd and Ulrich to Lyoko to help Aelita deactivate a tower, but he ends up alone, face-to-face with XANA.
End of Take
E8
End of TakeA movie director begins filming in our heroes' factory, so Ulrich works on the film to make sure no one discovers their secret. But that will be no easy task when XANA takes control of an alien monster prop intent on destroying the heroes.
Satellite
E9
SatelliteWhen all the student's cell phone goes off in class, it starts Sissy on a petition to save her cell phone--but it's goes awry when Odd breaks into the school's office's locker to get his, Ulrich, & Yumi's cell phone. It turns out that X.A.N.A. is trying to get out board a highly powerful miltiary satellite in space. X.A.N.A.'s target turns out be our heroes.
The Girl of the Dreams
E10
The Girl of the DreamsAround the same time that Jeremie loses contact with Aelita, a new student named Taelia resembling her arrives to Kadic. Believing that Taelia is Aelita with amnesia, Jeremie reveals the existence of Lyoko to her. Meanwhile, X.A.N.A. possesses samurai armor that Yumi had brought to school for a presentation.
Plagued
E11
PlaguedWhen the gang learns that if Jeremy passes a few tricky quizzes, that he'll get transferred to another school, they quickly seek a way for him to stay, even if it means failing the test on purpose. Meanwhile, XANA gains possession of a pack of rats, using them to attack the flow of power in the city as well as his earthbound enemies.
Swarming Attack
E12
Swarming AttackUlrich is fussing over a mysterious letter found slipped under his door one night... a love letter signed by Yumi! Meanwhile, XANA infects a hive of bees and is using it to attack our heroes. Ulrich struggles with his feelings and how to tell Yumi how he feels about her; that is, if he can figure it out himself, and saving the day from XANA in an episode of life and death.
Just in Time
E13
Just in TimeJeremy has trouble materializing Aelita, and actually makes matters worse. While he tries to de-bug her program, XANA launches his latest attack, putting Odd in grave danger. Our heroes must decide: Defeat XANA or sacrifice Aelita?
The Trap
E14
The TrapXANA takes control of the factory and traps Yumi, Ulrich and Sissi in the elevator, which plummets to the ground and begins filling with water. Yumi escapes and gets help from Odd and Aelita to deactivate a tower on Lyoko before they drown.
Laughing Fit
E15
Laughing FitXANA unleashes an attack of laughing gas on the school, inducing fits of laughter which leave our heroes dangerously short of breath. While they try to thwart XANA's latest scheme, Yumi is concerned about her parents who are about to visit.
Claustrophobia
E16
ClaustrophobiaX.A.N.A. short-circuits the Kadic cafeteria in order to trap Odd, Ulrich, and a bunch of students in an electrified prison. Jeremie, Yumi, and Aelita race to deactivate the tower before it is too late. Meanwhile, Herb becomes jealous of a new student named Theo who is via for Sissi's affection.
Amnesia
E17
AmnesiaXANA creates viruses which attack human brains, causing amnesia. Sissi takes advantage of this and convinces Ulrich that Odd, Yumi and Jeremy are his enemies. Now they must battle their friend and find a way to reverse the viruses.
Killer Music
E18
Killer MusicWhen X.A.N.A. creates an MP3 file that puts anyone who listens to it into a coma, Odd ends up being the first victim. Soon, the rest of the city begins to follow, including Ulrich and Jeremie.
Frontier
E19
FrontierJeremy convinces Yumi to send him to Lyoko so he can speak in-person with Aelita, but when she hits the wrong key, he becomes stuck between worlds. While they struggle to bring Jeremy back, XANA unleashes a deadly attack on Aelita.
The Robots
E20
The RobotsBoth 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 is using the factory to built a robot. Ulrich & Yumi get help from Herb in slow down Xana's robot. Jeremy discovers that Xana's robot was built in the factory and has messed with the computer that goes to Lyoko.
Zero Gravity Zone
E21
Zero Gravity ZoneXANA creates an ever-increasing zero-gravity zone on the field during the Kadic soccer final, forcing Ulrich to decide whether to stay with his teammates on the soccer field, or help his friends battle the super computer in Lyoko.
Routine
E22
RoutineTired of the same old routine of fighting X.A.N.A., Ulrich decides it's time for a change, which leads to strife between him and Yumi. Meanwhile, X.A.N.A. infects himself with a virus in order to disrupt the scanner program. This will lead the warriors to their death if they can't stop him.
Rock Bottom?
E23
Rock Bottom?In preparation for a secretly-planned dance party at Yumi's house, Odd gets in trouble with the Kadic administration when he covers up the attempted theft of a computer by his friend, Sam. Meanwhile, X.A.N.A. alters the city's earth level in an attempt to bury his enemies.
Ghost Channel
E24
Ghost ChannelXANA traps Ulrich, Odd, and Yumi in a virtual universe and they don't realize there's a fake Jeremy with them who is intent on destroying them. The real Jeremy must now save his friends single-handedly before it's too late.
Code: Earth
E25
Code: EarthAs Jeremie is perfecting his materialization program for Aelita, Yumi, Ulrich, and Odd are making preparations for her arrival. But as success comes within their grasps, Jim's paranoia aggravates the already bad situation started by X.A.N.A. Due to his injured ankle Jeremie has no choice but to reveal the existence of Lyoko to Jim so he can get to the warehouse.
False Start
E26
False StartWhen Jeremie discovers a fatal connection between a materialized Aelita and the supercomputer, the gang realizes that they will have to postpone their attempts of ridding the world of X.A.N.A. Meanwhile, the corrupted supercomputer decides to engage the warriors in the real world by materializing his monsters for the first time.