Season 2

Title	Airdate	# in series	# in season

"Teddygozilla"	April 19, 2004	1	101
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 their age, saying they'll never get a date. Milly tries to ask Ulrich out, and he is forced to turn her down. 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 had made fun of her. It then increases the teddy bear's size to roughly two stories and sets it on the town. Now the group has to shut down the tower and protect the rest of the town from a rampaging teddy bear. After a return to the past, Milly asks Ulrich to the dance again, and Ulrich says yes, embarrassing Sissi.

"Seeing Is Believing"	April 20, 2004	2	102
After a lecture on nuclear power in class, Odd begins 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 is reluctant to let him on. Meanwhile, Xana decides to overload the nuclear power plant by storing electricity in a transformer and unleashing it on the plant all at once. Unsure if they can stop such an event, the group votes and, by a 3 to 2 vote, decides to tell the authorities. Yumi goes to inform them while the others stay behind to deal with Xana. Now they must deactivate the tower before the city is turned into a nuclear wasteland. Not only that, they also have to do so before the authorities find out about the supercomputer.

"Holiday in the Fog"	April 21, 2004	3	103
After Jeremie paints graffiti protraying Jim in a less than favorable light on a wall in order to remain at school during a vacation, Sissi overhears him talking with the others about his reasons for doing so: namely, watching 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 it into a deadly, living gas. When Jeremie finds out, he calls his friends away from their respecitive vacations. Xana uses the gas to attack Jeremie, Jim, and Sissi, and Jeremie just barely makes it out. Ulrich stays behind to find Jim and Sissi while the others go to deactivate the tower.

"Log Book"	April 22, 2004	4	104
When Sissi finds Ulrich's diary, he is blackmailed into being her boyfriend. During a trip to a swimming pool, Jeremie 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. Xana then turns the bus on the city's petro-chemical plant, threatening to blow up a sizable portion of the city.

"Big Bug"	April 23, 2004	5	105
Xana launches an attack on the Internet itself, managing to disable much of the city's infrastructure. Though most of the problems caused can be bypassed by manual controls, two trains that are completely automatic are put on a collision course, one of which contains a load of highly toxic chemicals.

"Cruel Dilemma"	April 26, 2004	6	106
Due to a favorable accident on Odd's part, Jeremie's materialization program for Aelita is finished. In turn, Xana possesses two bulldozers and sets them on the factory to prevent Aelita's materialization from taking place.

"Image Problem"	April 27, 2004	7	107
After an unexplained incident on Lyoko ends up devirtualing Yumi without any cause, Yumi is taken to the infirmary. After waking up, she attacks Yolande. She continues to act weird throughout the day, wanting to go to Lyoko with everyone else. Jeremie won't let them, though, because he wants to know just what caused Yumi's devirtualization. Meanwhile, on Lyoko, Aelita finds several Kankrelats guarding an orange sphere, which she calls a Guardian, and informs Jeremie. Back at the school, the principal confronts Yumi about her attack on Yolande. When he threatens to call her parents, she attack him, too. In another attempt to get the group to Lyoko, Yumi tries to seduce Jeremie to convince him to arrange a mission. She fails, but Odd and Ulrich stumble upon the scene. Jeremie tries to explain, leaving Yumi alone. Jeremie apolgizes for the incident, citing Yumi's strange behavior. When they head back to his room, they find his computer destroyed. Yumi seems the likely culprit. She shows up to meet them, still wanting to go to Lyoko. Having no choice, they go, but Yumi stops the scanner before it can close, leaving her alone in the scanner room. As she goes to work destroying the scanners, the others find the real Yumi trapped inside the Guardian.

"End of Take"	April 28, 2004	8	108
After the principal shows a movie about aliens made director named James Finson, Finson announces that he plans to make a movie in the city, using the factory as the prime 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 opposite result, and he's even given a part in the movie, but the prinicipal won't let him miss school. Sissi, who wants to be in the movie, convinces her father to let Ulrich miss school so she'll get a part. While Ulrich is guarding the lower levels, Xana possesses the aliem monster prop and uses it to capture Ulrich and use him as bait for the others.

"Satellite"	April 29, 2004	9	109
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, Jeremie investigates the strange occurrence and learns that Xana is using the school's antenna to take over the nearby television antenna. From there, Xana could take over a laser-equipped, military satellite. While Odd and Ulrich head to Lyoko to prevent Xana from doing so, Yumi stays behind to support Sissi's protest. As they head for the tower, Xana succeeds in taking over a military satellite and turns it on the school. Odd, who gets devirtualized, has to keep Yumi safe while Aelita and Ulrich look for a tower that seems to be invisible.

"The Girl of the Dreams"	April 30, 2004	10	110
After Jeremie makes another failed attempt to materialization Aelita, a student arrives at school that looks exactly like her. Jeremie is convinced that it must be her, but she seems to have no memory of her experiences with the group. The others aren't quite as convinced, but Jeremie insists that the materialization process must have caused her to lose her memory. Xana then possesses a suit of samurai armor that Yumi brought to school and sets it on the group.

"Plagued"	May 3, 2004	11	111
Xana possesses a rat that tries to sneak a bite from the school's kitchen. That rat goes on to bite other rats, putting them under Xana's control. Meanwhile, the school counselor has been watching Jeremie and believes him to be a gifted student. As such, he believes that Jeremie would be better off at a more advanced school and decides to give him an aptitude test. During the test, Xana's army of rats attacks the school.

"Swarming Attack"	May 4, 2004	12	112
After failing with an army of rats, Xana attempts a similar tactic using bees. 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. Jeremie and Odd find out about the note, but don't learn who wrote it. Ulrich tells them not to tell Yumi. After learning about the bees and Xana's control over them, the group heads for the factory. Ulrich talks to Yumi about the note and that tells her that he feels the same way, only to find out that it was Sissi who wrote it. In Lyoko, Ulrich's reaction to the discovery leaves his performance lacking as the bees move on the school.

"Just in Time"	May 5, 2004	13	113
Taking a different approach to his research, Jeremie materializes a single hair of Aelita's. Unfortunately, the follow-up test goes awry, and Jeremie has to find out why. Meanwhile, different parts of the school begin to crumble apart. Jeremie 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, which continues to get worse. Jeremie has to fix the damage he caused in time to save Odd, who ends up trapped in the school with Milly and Tamiya.

"The Trap"	May 6, 2004	14	114
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. Jeremie 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 earlier possession allows him to trap all three in the elevator and drop them to the bottom of the shaft. Sissi and Yumi come out ok, but Ulrich's arm is broken in the fall. Meanwhile, Jeremie and Odd have to deal with the possessed factory equipment.

"Laughing Fit"	May 7, 2004	15	115
In class, Mrs. Hertz is teaching the class about nitrous oxide, more commonly known as laughing gas, and its effects. It can be dangerous if not neutralized by water quickly. Meanwhile, Yumi's parents are having trouble with their relationship, which Yumi isn't too happy about. No one can seem 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 possess the laughing gas in the science room and uses it to attack Odd, who is doing the music. Sissi pours water on him, unaware of the cause of his maniacal laughing. When Odd tells the others about his experience, they realize that Xana must be behind it. The play turns out to be the perfect way to get Yumi's parents back together, so Ulrich, who is forced into playing Romeo, and Yumi, who plays a guard, stay behind while Odd heads to Lyoko. Just as Odd is about to dispart, the Xana-possessed gas goes after each member of the group. Odd gets to Lyoko, but the gas goes with him, weakening him severely. Jeremie is chased away from the factory by the gas and is forced to take refuge in the sewer water. Finally, Ulrich and Yumi are attacked during the play. Aelita and a weakened Odd have to get to the tower before the others laugh themselves to death.

"Claustrophobia"	May 10, 2004	16	116
When a boy named Theo takes an interest in Sissi, Hervé becomes jealous and tries to get him expelled. The situation only gets worse when Xana possesses the cafeteria during lunch, trapping most of the students inside its electified walls. Jeremie and Yumi leave the cafeteria before this takes place. Now Yumi has to has to get Aelita to the tower by herself before the cafeteria collapses in on itself.

"Amnesia"	May 11, 2004	17	117
When Ms. Hertz gives a lesson on nanotechnology, she has small machine designed to produce the little robots as an example. Little do they realize that Xana has infected it, so when they find it filed with gel, Odd carelessly ends up pushing Ulrich's face into a small scoop of it. Later on, Ulrich gets a headache and collapses. 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 group tries to bring him to his senses, more cases of amnesia occurs, spreading from person to person like a disease. Only after most of the school is affected does Jeremie realize that Xana-produced nanotechnology is responsible.

"Killer Music"	May 12, 2004	18	118
When Xana creates a 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.

"Frontier"	May 13, 2004	19	119
When Jeremie has a fight with Aelita, he tries to go to Lyoko to apoligize. Unfortunately, a scanner error leaves him trapped in a vitual limbo between Lyoko and the real world.

"The Robots"	May 14, 2004	20	120
During a school robot competition, Xana sends a robot of his own to deal with the group. Ulrich and Yumi are forced to enlist Hervé's help to destroy it while Jeremie and Odd head to the factory to shut down the tower.

"Zero Gravity Zone"	May 17, 2004	21	121
Just before an official school soccer game, Xana starts nullifying gravity by creating electromagnetic fields around specific areas. Ulrich does not want to help stop Xana this time around, instead needing to impress his parents, who will be attending the game. The others have to stop Xana before the entire school is sent into orbit.

"Routine"	May 18, 2004	22	122
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.

"Rock Bottom?"	May 19, 2004	23	123
During a vacation period at the school, the group plans to have a party at Yumi's house. Odd promisese to have a DJ at the party. This DJ, named Samantha, is also his girlfriend, who goes to another school. After meeting up, she has Odd take her to the computer room. Once they arrive, she tries to steal a laptop, since she's too poor to afford one. Odd stops her, but ends up being caught by Jim. Meanwhile, Xana causes the ground under the city to melt, making all the building sink.

"Ghost Channel"	May 20, 2004	24	124
After another successful battle against Xana and another return trip, Odd, Ulrich, and Yumi are nowhere to be found. They, however, do not see anything wrong with where they are. Xana has trapped them in a world of its own design, and fashioned it after the school to ease their suspicions. Meanwhile, in the real world, Jeremie is being questioned on the group's disappearance.

"Code: Earth"	May 21, 2004	25	125
Jeremie 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.

"False Start"	May 24, 2004	26	126
Aelita's materialization program has worked and she's now living on Earth, but not all is well. A virus given to her by Xana has linked her to the supercomputer, preventing the group from shutting it off. Furthermore, Xana brings his Kankrelats into the real world in mass numbers and unleashes them on the school.

[edit] Second season: 2005

Title	Airdate	# in series	# in season

"New Order"	September 19, 2005	27	201
After discovering Aelita's link to the supercomputer and the inability to shut off the supercomputer tha stems from it, Jeremie 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. 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. His name is William. He comes from another school, having been expelled from it. During the field trip, Aelita and Jeremie partner up. Jeremie 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 power before they are boiled alive.

"Unchartered Territory"	September 20, 2005	28	202
While Aelita adjusts to her new life on Earth, Jeremie and the others investigate the mysterious owner of the Hermitage, Franz Hopper, and his link to the supercomputer, Lyoko, and Xana.

"Exploration"	September 21, 2005	29	203
After discovering Carthage, the group decides to explore it. Yumi is forced to opt out after her continued late-night trips to Lyoko have drawn the attention of her parents.

"A Great Day"	September 22, 2005	30	204
After taking another trip to Carthage and returning to the school, Aelita talks to Jeremie about her not being human, unaware that Sissi is recording their conversation. On top of that, the data they had retrieved from Carthage takes over the supercomputer and starts running return trips over and over.

"Mister Pück"	September 23, 2005	31	205
When Aelita's dreams 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 Pück. 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 to insure they'll never be able to read it.

"Saint Valentine's Day"	September 26, 2005	32	206
It's Saint Valetine's Day and love is in the air. When a man possessed by Xana leaves a necklace at Aelita's door, Aelita is convinced that it was Jeremie who got it for her. Since Jeremie didn't actually get it, he's left to wonder who did, and ends up suspecting Odd, who avoids the question. This puts the two at odds, so to speak. Meanwhile, Aelita's necklace takes control of her and forces her to deliver herself to the Scyphozoa.

"Final Mix"	September 27, 2005	33	207
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 Jeremie to help. Jeremie 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.

"Missing Link"	September 28, 2005	34	208
During a mission to Carthage, Yumi is attacked by the Scyphozoa. It steals her digital genetic code, leaving her stranded on Lyoko. To make matters worse, it's picture day for her class. 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, Jeremie tries to come up with a way to bring Yumi back. Aelita thinks of a way, but won't tell Jeremie about it. She only tells him once she gets to Lyoko, so he can't object. She begins to transfer her own genetic code to Yumi, which will let Xana take her memory at will.

"The Chips Are Down"	September 29, 2005	35	209
When Ulrich learns that Yumi might have to go back to Japan because her father lost his job, he can't accept losing her. After a misguided attempt to write a letter to the president, he hears the lottery numbers on the radio and gets an idea. Using a return trip, he is able to get a ticket with the winning numbers and give it to Yumi's 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 Krabbes to guard it.

"Marabounta"	September 30, 2005	36	210
After deciphering a part of Franz Hopper's diary, Jeremie gets an idea to make a monster that fights on the side of good. By combining techniques, he makes the Marabounta, a sphere that can replicate itself endlessly and devour any monster it can encase. Though it works quite well to begin with, everything goes wrong when it senses Aelita's link to Xana. After Odd attacks it to save her, it goes haywire and threatens to devour all of Lyoko.

"Common Interest"	October 3, 2005	37	211
When the supercomputer's uranium power source begins to fail, 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.

"Temptation"	November 25, 2005	38	212
After a Xana attack, Jeremie insists on a return trip, regardless of the fact that Xana didn't even 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 trip, Jeremie is found unconscious in his room. Upon decoding a video diary that is stored on his computer, they learn that he had been using the return trips to increase his own intelligence. When he's about to be taken to the hospital, Xana attacks, possessing the ambulence and driving it towards the river. Now the others have to save Jeremie and deactivate the tower without Jeremie's help.

"A Bad Turn"	October 26, 2005	39	213
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 Krabe. 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 fight and get detention because of it. Jeremie learns of the activated tower shortly after and the group heads to the factory without Ulrich. During this time, the Krabe makes its way to Yumi's house. When the group reaches the factory, they find a second Krabe guarding it. Yumi learns of the first Krabe from Hiroki and goes to help while Odd distracts the first so they can get to the elevator. In the scanner room, it's learned that the first two Krabbes destroyed the scanners that produced them, leaving just one usable. Aelita goes to Lyoko first. Before Odd can go, however, a third Krabe is materialized, preventing any further use of the scanners. Now Odd has to deal with this Krabe, Ulrich and William have to deal with the second, and Yumi and her family have to deal with the first. Not only that, but Aelita has to make her way to the tower without any support.

"Attack of the Zombies"	October 4, 2005	40	214
When Xana possesses Kiwi, it turns the little dog into the carrier for a virulent virus that turns those it infects into zombies. Aelita and Jeremy are stuck in the cafetiria and cant get to the factory.

"Ultimatum"	October 5, 2005	41	215
After Xana possesses the principal and kidnaps Odd and Yumi, it gives Jeremie and ultimatum: deliver Aelita to the Scyphozoa or sacrifice his friends.

"A Fine Mess"	October 6, 2005	42	216
After a malfunction with the regular materialization program, Odd and Yumi end up in each other's bodies. Even worse, their atoms start to split after a while. The gang has to go to Lyoko and fix the problem before Odd and Yumi disappear forever, but it's not easy when Xana tries to stop them.

"Xana's Kiss"	October 7, 2005	43	217
Xana creates a ghost that can change its shape at will and doesn't need to possess a host, then uses it to drive a wedge between the group by having it kiss people while disguised as them.

"Vertigo"	October 24, 2005	44	218
After a trip to Carthage, Jeremie 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 Hervé, who is no match 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, Jeremie finds the anti-virus and gives it to Aelita. Despite some problem with the application, it seems to work. However, this does not last. An error in the anti-virus causes her to turn invisible. On top of that, she can't enter the towers on Lyoko, making it impossible for her to stop Xana's latest attack, which is a possessed pack of wolves targeting Odd, Ulrich, and Yumi.

"Cold War"	October 25, 2005	45	219
A famous reporter named Thomas Vincent visits the school, planning to do a story on the lackluster performance of today's schools. Meanwhile, Xana begins to exhibit some strange behavior, activating towers and then deactivating them before the group can get to them. Confused, Aelita and Jeremie stay at the factory to investigate while the others head back. It's only after they head back that Xana takes action, activating a tower and causing a massive snowstorm. With a snowstorm between them and help, Jeremie is forced to send Aelita to Lyoko alone.

"Déjà Vu"	October 27, 2005	46	220
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 consciousnesss while at the pool. Wanting to know the source of the visions, she heads to the Hermitage to learn more about them. Jeremie discovers that Xana is causing the visions through her link to the supercomputer. During the mission to stop them, Aelita breaks away and heads to Carthage, determined to discover the source of the visions.

"Tip-Top Shape"	October 28, 2005	47	221
During the school physicals, Xana possesses the school nurse and has her kidnap Aelita. The rest of the group beats her to the factory, but has no way to get Aelita from the far more powerful nurse. Having no other choice, Jeremie 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. His turn green instead of red. Odd volunteers, and is enhanced by a ghost of Jeremie's design. This allows Odd to fight the nurse effectively while the others deactivate the tower. This fortune doesn't last, however. Xana is able to take over Jeremie's tower, reversing the effect of the ghost to drain Odd's energy. Now the group has to deactivate not only the original tower, but the tower that's draining Odd's energy.

"Is Anybody Out There?"	November 1, 2005	48	222
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 Jeremie. Jeremie can't find an activated tower, which seems wrong considering the situation. As Jim patrols the hallways, he is picked up by an invisible object. Jeremie, Odd, and Ulrich arrive to spray it with a fire extinguish, confirming that it's a ghost and implying that the super scan is broken. With the ghost on the loose, the group heads off to the factory. After they arrive, Aelita, Odd, and Yumi head to Lyoko. Odd looks for the tower while the other two head to Carthage to fix the super scan. Meanwhile, Jeremie and Ulrich are left to deal with the ghost.

"Franz Hopper"	October 31, 2005	49	223
Jeremie discovers five activated towers and gathers the group to take care of them. 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 says that he's none other than Franz Hopper. However, something seems off about this convient arrival.

"Contact"	November 25, 2005	50	224
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 some strange language, focusing on Jeremie as she does. She is taken to the infirmary as a result. Later on, she walks into Jeremie's room and writes some code on a piece of paper. Jeremie 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 her. On a trip to Lyoko, Aelita and Ulrich discover a white tower. Xana isn't happy about the tower, and sends Megatanks to shut it down forcibly. At the same time, it activates a tower and possesses a nurse at the hospital to do the same to Sissi. Odd and Yumi are able to prevent the nurse from doing so. They bring Sissi to the factory to finish the message she started earlier. She manages to type most of it out before Xana succeeds in shutting down the white tower. After Xana's tower is shut down, Jeremie translates the message, revealing that Franz Hopper had activated the white tower.

"Revelation"	December 9, 2005	51	225
It's nearing the end of the year and Jeremie's research has hit a dead end. After the group collects some data from Carthage, 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 Jeremie. Putting it out of his mind, he begins his plan to decipher the diary. Shortly after they begin, the ghost turns on the group, devirtualizing Yumi and chasing Ulrich away from the tower as three Tarantulas arrive to protect it. At the same time, Xana attempts to take over Jeremie's tower, locking the decoding procedure so they can't abandon it. Jeremie realizes the true nature of the ghost during the fight, and Yumi goes off to find the real Odd. After the ghost proves to be ineffective against Ulrich, it shapeshifts into a clone of Ulrich. In this form, it proves to be an equal match for him. After much fighting, Ulrich finally bests the clone, but is taken out by a Tarantula shortly after. Just when it looks like Jeremie's tower will fall, Franz Hopper steps in and protects it. The diary then decodes fully. After examining the diary, Jeremie tells Aelita that she is Franz Hopper's daughter.

"The Key"	December 9, 2005	52	226
After going through all of Franz Hopper's diary, Jeremie discovers the truth behind the supercomputer, at least to some extent. Hopper had 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 Xana was after. He only needed her half, now. The keys would allow him to escape the supercomputer. Jeremie also finds a way to free Aelita from the supercomputer. It turns out that Aelita never had a virus. In fact, Xana had been holding onto a piece of her, which was responsible for linking her to the supercomputer. Aelita is not willing to go, angry over the fact that Hopper had essentially taken her life from her. She's also worried that Xana might escape. To that end, she shuts down the supercomputer. Jeremie rescues her, and the group goes to Lyoko to retrieve her fragment. After all their efforts, they seem to succeed, but it turns out to be a fake. Xana manages to devirtualize Aelita's defenders and steal her memory, effectively killing her and allowing him to escape, which shuts down Lyoko in the process. His escape allows Franz Hopper to revive Aelita and Lyoko, restoring all of Aelita's memories in the process. Through the restoration, Aelita finally remembers her past up to the point that she went to Lyoko. With Xana now free and Aelita's memories returned, neither are linked to the supercomputer. This means that they could shut it down, but it would do no good. Unsure of how they'll proceed, Jeremie promises that they'll find a way to stop Xana.