Code Lyoko: Season 2

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 Tarantul

While Aelita adjusts to her new life on Earth, Jeremy and the others investigate the mysterious owner of the Hermitage, Franz Hopper, and his link to the Supercomputer, Lyoko, and XANA. It is discovered that Franz Hopper was a former teacher at Kadic. After being teased by Sissi, Aelita retreats to Lyoko but gets lost. Jeremy finds her in a previously undiscovered fifth sector of Lyoko, labeled Sector 5 by the group.

After discovering Sector 5, the group decides to explore it. Yumi is forced to opt out after her continued late-night trips to Lyoko draw the attention of her parents. While in Sector 5, Ulrich and Odd get devirtualized, but do not appear in the real world, so Yumi sneaks out of the house to go to Lyoko and rescue Aelita from the Scyphozoa while Jeremy searches for a way to recover Odd and Ulrich. Unfortunately, Yumi's parents discover that she is missing and alert the school, who in turn discov

After taking another trip to Sector 5 and returning to the school, Aelita talks to Jeremy about not being human, unaware that Sissi is recording their conversation. On top of that, the false data they retrieved from Sector 5 allows XANA to take over the Supercomputer and starts running return trips over and over. Jeremy discovers the return to the pasts are making XANA stronger and more powerful. During the third return trip, XANA possesses Sissi with his newly acquired and greatly strengthened

When Aelita's dreams and hallucinations become too disruptive to ignore, the group heads to the Hermitage to discover their source. There, Aelita finds a doll she inexplicably recognizes to be Mister Puck. Hidden on this doll is a key to a train station locker, which contains the heavily encrypted diary of Franz Hopper. Upon its discovery, XANA takes action, possessing Jeremy, to ensure they'll never be able to read it. When they deactivate the tower and Jeremy comes to his senses, Yumi explains

It's Saint Valentine's Day and romance is blossoming in the air. Ulrich forgets, so at last minute writes a poem for Yumi. However, when William presents Yumi with flowers, Ulrich gets jealous and reads the poem to Sissi instead, hoping to elicit jealousy from Yumi. In return, Yumi kisses William on the cheek. Ulrich and Yumi end up in a fight, both bothered and wondering if the other really likes them. Additionally, a man possessed by XANA leaves a necklace at Aelita's door. Aelita is convinced

When the school holds a concert in the gym, William accidentally drops a mixing board for the DJ contest. Odd offers to fix it, and tries to get Jeremy to help. Jeremy is busy, so Aelita offers her help. She easily fixes the device, and finds that she is quite talented in using it. The school is holding its finals, as well, and Odd finds that he is not prepared in the least. Meanwhile, XANA possesses Jim and takes Aelita to the factory in order to deliver her to the Scyphozoa.

During a mission to Sector 5, the Scyphozoa attacks Yumi, stealing her human DNA, leaving her trapped on Lyoko. To make matters worse, it's picture day for her class and she will be suspended if absent. After some discussion, Ulrich gets the idea to have Sissi stand in for Yumi. Strangely, Sissi agrees and asks for nothing in return. During this, Jeremy tries to come up with a way to bring Yumi back. Aelita thinks of a way, but will not tell Jeremy about it. She only tells him once on Lyoko, so

When Ulrich learns that Yumi might have to go back to Japan because her father lost his job, he cannot accept losing her. After hearing the lottery numbers on the radio though, he gets an idea. Using a return trip, Ulrich is able to get a ticket with the winning numbers and give it to her parents. When the others find out, they kick him out of the group until they can figure out what to do. To make matters worse, XANA activates a tower and possesses Nicolas. On top of that, he creates an army of

After deciphering a part of Franz Hopper's diary, Jeremy gets an idea to make a monster that fights on the side of good. By combining techniques, he makes the Marabounta, a black sphere that can exponentially replicate itself endlessly and devour any monster it may encase. Though it works quite well to begin with, everything goes wrong when it senses Aelita's virus, which is linked to XANA. After Odd attacks it to save her, the Marabounta goes haywire and threatens to devour all of Lyoko, so XAN

When the Supercomputer's main nuclear battery starts failing, XANA is forced to possess a local criminal named Peter Duncan to replace it. The Supercomputer's periodic shutdowns threaten not only XANA, but also Aelita, whose heart stops beating with each shutdown due to her connection to the Supercomputer. XANA soon captures Jeremy to change the battery to the Supercomputer.

After XANA's attack, Jeremy insists on a return to the past, regardless of the fact that XANA does not cause any damage. When questioned, he gets defensive and angry, insisting that it's necessary. Further questioning on the matter leads to the same result. After the next return to the past, Jeremy is found unconscious in his room. Yumi and Ulrich go searching through Jeremy's room to see what they can find about Jeremy's problem. Upon decoding a video diary that is stored on his computer, they

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

When XANA possesses Kiwi, it turns him into the carrier for a virulent virus that turns those it infects into zombies. To make matters worse, Aelita and Jeremy are stuck in the cafeteria and cannot get to the factory. On top of that, Odd is a zombie himself. Jeremy and Aelita escape but Ulrich and the other students (except William, who is turned into one himself) fight the rest.

After XANA possesses Principal Delmas and kidnaps Odd and Yumi, he gives Jeremy an ultimatum: deliver Aelita to the Scyphozoa or sacrifice Odd and Yumi. However, Jeremy and Aelita go to Sissi for help after being questioned by the police. Sissi agrees to be temporarily part of the group to help save her father and stop XANA.

After a malfunction and a little bug with the regular materialization program, Odd and Yumi are bugged up, ending up in each other's bodies. Even worse, their atoms start splitting after a while due to being devirtualized, even on Lyoko. The gang has to go to Lyoko and fix the problem before Odd and Yumi disintegrate and disappear forever, but it's not easy when XANA tries to stop them.

XANA creates a ghost called a polymorphic specter, that can change its shape or form at will and does not need to possess a host, then uses it to drive a wedge between the group by having it kiss people while disguised as them. At the end of the episode, Aelita kisses Jeremy to see how he'll react. He predictably freezes up.

After a trip to Sector 5, Jeremy believes he has the data necessary to cure Aelita's virus. While the two work on the cure, Odd, Ulrich, and Yumi go to a rock climbing contest. Odd races against Herb, who is no match for Odd. William then goads Ulrich into racing, despite his obvious reluctance. During the race, Ulrich gets dizzy and falls. Yumi realizes that he must have vertigo. Ulrich, embarrassed, runs off. Meanwhile, Jeremy finds the antivirus software and gives it to Aelita. Despite some p

Jeremy is woken up to an alarm signal, with no activated towers, so he goes back to sleep. The next morning, while Jeremy and Aelita are investigating Jeremy's computer, Odd looks for his DVD of his movie to show the famous news reporter T.V. (Thomas Vincent), who is coming to the school to do a report on the lackluster of today's schools. Later, another tower is activated and Odd, Ulrich and Aelita are sent to Lyoko, only for the tower to deactivate itself. Then another tower activates and deac

Aelita's visions become a problem once again, but not the same visions as before. This time, she has visions of her and Franz Hopper being chased by government agents. The visions come even when she's awake, causing her to lose consciousness while at the pool. Wanting to know the source of the visions, she heads to the Hermitage to learn more about them. Jeremy believes that XANA is causing the visions through her link to the Supercomputer. During the mission to stop them, Aelita breaks away and

During the school physicals, XANA possesses the school nurse, Yolanda, and has her kidnap Aelita. The rest of the group beat her to the factory, but have no way to get Aelita from the far more powerful nurse. Having no other choice, Jeremy decides to test out an experiment which will give a person the same powers as one possessed by XANA. To do this, he has to activate a tower like XANA. Odd volunteers, and is enhanced by a ghost of Jeremy's design. This allows Odd to fight the nurse effectively

After reading about a dead man named Leon Corbe, who died during the construction of Kadic, Sissi decides to hold a séance to communicate with him. She manages to convince Ulrich to attend. During the séance, one of XANA's ghosts appears in the form of a four-armed monster. At first, it seem docile, but quickly gets angry and attacks. Ulrich leaves Sissi with Odd while he goes to tell Jeremy. Jeremy cannot find an activated tower, which seems wrong considering the situation. As Jim patrols the h

Jeremy discovers five activated towers and gathers the group to take care of them. However, when they arrive at the factory, they find a man at the interface, deactivating the towers as if it were a simple matter to do so. When questioned, the man claims that he's none other than Franz Hopper. However, something seems off about this convenient arrival. Franz says that the scanners cause cell degeneration, and blames it and the destruction of his diary on Jeremy. With everyone except Aelita angry

During a short film made by Odd and starring Sissi, Sissi seems to be possessed by a ghost. She does not act as expected, however. Instead, she starts speaking in an unknown language, focusing on Jeremy as she does. She is taken to the infirmary as a result. Later on, she walks into Jeremy's room and writes some code on a piece of paper. Jeremy translates the code, revealing a message stating a desire to help. Sissi is sent to the hospital after this, forcing Odd and Yumi to go there and collect

It is nearing the end of the year and Jeremy's research has hit a dead end. After the group collects more data from Sector 5, he plans to use a tower to decipher Franz Hopper's diary. Before the mission, Odd gets a message from a mystery girl. When he goes to meet her, he is attacked by one of XANA's ghosts and locked inside a well at the Hermitage. The ghost then assumes Odd's form and goes to Lyoko in his place. The tower that XANA activated to make the ghost then deactivates, confusing Jeremy

After reading Franz Hopper's diary, Jeremy discovers the truth behind the Supercomputer, at least to some extent. Hopper has used it quite extensively, to the point of repeating a single day for more than seven years. His sanity degraded throughout the experience. Hopper also revealed that he and Aelita hold the Keys to Lyoko, which were what XANA is after so he can escape the supercomputer. Jeremy also discovers Aelita never had a virus, and XANA had taken a fragment of her, which is responsibl