Code Lyoko (2003–2007)

1. S01E01TeddygozillaSeptember 3, 2003 7.5A 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
2. S01E02Seeing Is BelievingSeptember 10, 2003 9.0Odd 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
3. S01E03Holiday in the FogSeptember 17, 2003 9.0Ulrich and Jeremy are doing graffiti on a wall on campus while Kiwi wakes up Jim. When Jim passes Ulrich and Jeremy, Ulrich gets away, but J
4. S01E04Log BookOctober 1, 2003 9.0Sissi has found something very special and dear to Ulrich, his diary! Unfortunately the diary contains some information on X.A.N.A. and Lyo
5. S01E05Big BugOctober 1, 2003 9.0The 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
6. S01E06Cruel DilemmaOctober 8, 2003 9.0Jeremie is working on the materialization program, and finally gets it. Jeremie wants to matierialize Aelita, but realizes that preparation
7. S01E07Image ProblemOctober 15, 2003 9.0This episode starts out as Yumi and Aelita are running inside Lyoko looking for the activated tower. Then Yumi suddenly disappears! She come
8. S01E08End of TakeOctober 22, 2003 9.0When a director comes to town to film a movie, XANA posseses a plastic alien model in order to destroy Ulrich and the others.
9. S01E09SatelliteOctober 29, 2003 9.0When 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 break
10. S01E10The Girl of the DreamsNovember 5, 2003 9.0Jeremie mysteriously loses contact with Aelita. The same day, a new student named Taelia (who looks alot like Aelita) arrives at school. Je
11. S01E11PlaguedNovember 12, 2003 9.0Jeremie learns that he has to take a test. If he passes, he'll get transfered to a new school and nobody will be able to stop XANA. Speakin
12. S01E12Swarming AttackNovember 19, 2003 9.0Ulrich is fussing over a mysterious letter found slipped under his door one night... a love letter signed by Yumi! Meanwhile, XANA infects
13. S01E13Season's bestJust in TimeNovember 26, 2003 10.0The episode starts with Jeremie still trying to materalize Aelita. He calls the team to the factory to show them his latest development: a
14. S01E14The TrapDecember 3, 2003 9.0It's the anniversary of the day Jeremie and the others met Aelita. They begin planning a surprise for her, unaware that Sissi is spying. W
15. S01E15Laughing FitDecember 10, 2003 10.0After seeing laughing gas in Science class, Team Lyoko has to see it again - working for Xana. While working for Sissy in a school producti
16. S01E16ClaustrophobiaDecember 17, 2003 10.0After 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 decide
17. S01E17AmnesiaDecember 24, 2003 10.0When learning about NanoDoctors, small robots being designed to cure dieases, Ulrich holds some gel that the NanoDoctors would live in. Od p
18. S01E18Killer MusicDecember 31, 2003 9.0A 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 c
19. S01E19FrontierJanuary 7, 2004 9.0Jeremie is now taking his ""Materalize Aelita!"" campaign to levels unknown - quite literally. He virtualizes himself, but there isn't enou
20. S01E20The RobotsJanuary 14, 2004 9.0Both Herb & Jeremy are in a robot competition Herb with ""Iron Sissy"", and Jeremy with ""Kiwi 2."" Herb cheats by launching a gear from Si
21. S01E21Zero Gravity ZoneJanuary 21, 2004 9.0Xana 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 ga
22. S01E22RoutineJanuary 28, 2004 10.0Ulrich is getting tired of getting being rebooted so many times and waiting to find out if Yumi has feelings for him or not. He thinks thes
23. S01E23Rock Bottom?February 4, 2004 10.0Well, 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
24. S01E24Ghost ChannelFebruary 11, 2004 10.0One day at school, Jeremy notices that Odd, Ulrich, and Yumi are missing. Meanwhile, Odd, Ulrich, and Yumi ARE at school with Jeremy! What's
25. S01E25Code: EarthFebruary 18, 2004 10.0As Jeremy is perfecting his materialization program for Aelita, Yumi, Ulrich and Odd are making preparations for her arrival. But as success
26. S01E26False StartFebruary 25, 2004 10.0Aelita is materialized, but unfortunately, Xana implanted a virus inside of Aelita, so if Xana dies, so does Aelita. Then Xana decides to at

Season 1 ranked & reviewed

1. S02E01Season's bestNew OrderAugust 31, 2005 10.0After discovering Aelita's link to the supercomputer and the inability to shut off the supercomputer that stems from it, Jeremie works hard
2. S02E02Uncharted TerritorySeptember 7, 2005 9.5While Aelita adjusts to her new life on Earth, Jeremie and the others investigate the mysterious owner of the Hermitage, Franz Hopper, and h
3. S02E03ExplorationSeptember 14, 2005 9.5After discovering The Carthage Region, the group decides to explore it. Yumi is forced to opt out after her continued late-night trips to Ly
4. S02E04A Great DaySeptember 21, 2005 10.0After taking another trip to The Carthage Region and returning to the school, Aelita talks to Jeremie about not being human, unaware that Si
5. S02E05Mister PuckSeptember 28, 2005 9.0When Aelita's dreams and hallucinations become too disruptive to ignore, the group heads to the Hermitage to discover their source. There, A
6. S02E06Saint Valentine's DayOctober 5, 2005 10.0It's Saint Valentine's Day and love is in the air. Ulrich forgets, so at last minute writes a poem for Yumi. However, when William presents
7. S02E07Final MixOctober 12, 2005 9.0When 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
8. S02E08Missing LinkOctober 19, 2005 9.0During a mission to The Carthage Region, the Scyphozoa attacks Yumi, stealing her human DNA, having her trapped on Lyoko. To make matters wo
9. S02E09The Chips are DownOctober 26, 2005 10.0When Ulrich learns that Yumi might have to go back to Japan because her father lost his job, he can't accept losing her. After hearing the l
10. S02E10MarabountaNovember 2, 2005 9.0After 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 techn
11. S02E11Common InterestNovember 9, 2005 9.0When the supercomputer's uranium power source begins to fail, Xana is forced to possess a local criminal named Peter Duncan to replace it. T
12. S02E12TemptationDecember 7, 2005 9.0After a Xana attack, Jeremie insists on a return trip, regardless of the fact that Xana didn't even cause any damage. When questioned, he ge
13. S02E13A Bad TurnNovember 16, 2005 9.0Ulrich and William get into a fight over Yumi. When Xana activates a tower and materializes Krabbes, he attacks Yumi's house and destroys tw
14. S02E14Attack of the ZombiesNovember 23, 2005 10.0When Xana possesses Kiwi, it turns the little dog into the carrier for a virulent virus that turns those it infects into zombies. To make ma
15. S02E15UltimatumNovember 30, 2005 9.0After Xana possesses the principal of the school and kidnaps Odd and Yumi, he gives Jeremie an ultimatum: deliver Aelita to the Scyphozoa or
16. S02E16A Fine MessDecember 14, 2005 9.0After a malfunction and a little bug with the regular materialization program, Odd and Yumi are bugged up, ending up in each others' bodies.
17. S02E17XANA's KissJanuary 11, 2006 10.0Xana creates a ghost called a polymorphic specter, that can change its shape or form at will and doesn't need to possess a host, then uses i
18. S02E18VertigoJanuary 11, 2006 10.0After a trip to the Carthage Region, Jeremie believes he has the data necessary to cure Aelita's virus. While the two work on the cure, Odd,
19. S02E19Cold WarJanuary 18, 2006 9.0Jeremy 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 inv
20. S02E20Déjà VuJanuary 18, 2006 9.0Aelita'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 c
21. S02E21Tip-Top ShapeJanuary 25, 2006 9.0During the school physicals, Xana possesses the school nurse, Yolande, and has her kidnap Aelita. The rest of the group beats her to the fac
22. S02E22Is Anybody Out There?January 25, 2006 9.0After reading about a dead man named Leon Corbe, who died during the construction of Kadic, Sissi decides to hold a séance to communicate wi
23. S02E23Franz HopperFebruary 1, 2006 9.0Jeremie discovers five activated towers and gathers the group to take care of them. However, when they arrive at the factory, they find a ma
24. S02E24ContactFebruary 1, 2006 9.0During 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,
25. S02E25RevelationFebruary 8, 2006 9.0It's nearing the end of the year and Jeremie's research has hit a dead end. After the group collects some data from The Carthage Region, he
26. S02E26The KeyFebruary 8, 2006 9.0After going through all of Franz Hopper's diary, Jeremie discovers the truth behind the supercomputer, at least to some extent. Hopper had u

Season 2 ranked & reviewed

1. S03E01Straight To HeartSeptember 9, 2006 9.0After another three-week vacation, the group is still looking for a way to fight X.A.N.A.. X.A.N.A., meanwhile, is trying to destroy Lyoko,
2. S03E02Lyoko Minus OneSeptember 16, 2006 9.0During a field trip with the rest of her 10th grade class, Yumi finds herself facing off against the students, teachers, and bus driver, all
3. S03E03Tidal WaveSeptember 23, 2006 9.0Xana attacks the Lyoko warriors by possessing a large amount of food. At the same time, he bugs up The Mountain Sector by rising the digital
4. S03E04False LeadSeptember 30, 2006 9.0When Xana hacks into a weapon's manufacturing computer network and leaves a paper trail pointing to Jeremie, government agents arrive at the
5. S03E05AelitaOctober 7, 2006 9.0Aelita gets mad at Jeremie and she and Odd go into Lyoko without telling anybody, which causes problems. On lyoko, Xana creates a diversion
6. S03E06The PretenderOctober 14, 2006 9.0Odd and Ulrich are talking in the shower room when a young boy, Johnny, asks to talk to Ulrich. It turns out that Johnny likes Yumi, and bei
7. S03E07The SecretOctober 21, 2006 9.0After being rejected by Yumi, William makes it his mission to find out the secret she's hiding. Soon enough, he manages to follow Ulrich and
8. S03E08Season's bestTemporary InsanityNovember 1, 2006 10.0Before leaving Sector 5, Odd and Ulrich are hit by a weird red beam from a pair of Mantas. They both eventually begin to act strange in the
9. S03E09SabotageNovember 2, 2006 9.0When Xana sabotages the supercomputer, weird bugs begin cropping up in Lyoko. With its power rapidly draining, Jeremie needs to repair it be
10. S03E10Nobody in ParticularNovember 3, 2006 10.0During a test to materialize Ulrich directly into Sector 5, his mind and body become separated, leaving Ulrich's body trapped on Lyoko and h
11. S03E11Triple TroubleNovember 6, 2006 9.0When Odd complains that he doesn't have any cool powers on Lyoko like his friends, Jeremie designs him a teleportation power. It works, but
12. S03E12Double TroubleNovember 7, 2006 9.0With Xana's attacks becoming more and more difficult to handle, the group contemplates adding another member to the team to make things easi
13. S03E13Final RoundNovember 8, 2006 9.0After William is initiated into the group, a series of events leaves only him and Aelita to defend Lyoko's core. During William's first miss

Season 3 ranked & reviewed

1. S04E01William ReturnsAugust 13, 2007 9.0Using the data that Franz Hopper gave them, Jeremie and Aelita succeed in recreating Lyoko, which now holds only Sector Five. Soon after, Wi
2. S04E02Double TakeAugust 14, 2007 9.0In order to compensate for all of William, while under XANA's control, Jeremie sets to work designing new equipment for his friends and recr
3. S04E03Opening ActAugust 30, 2007 9.0Jim'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
4. S04E04Season's bestWreck RoomAugust 15, 2007 10.0There is a new recreation room at Kadic and William's clone is put in charge of it. Meanwhile, Jeremy has developed a program to get the rea
5. S04E05SkidbladnirAugust 16, 2007 9.0The new virtual, submersible "submarine" (as Jeremy calls it) is almost complete, the last step being a secondary program that needs to be r
6. S04E06Maiden VoyageAugust 17, 2007 9.0The gang manages to convince Jeremy to let them test out the Skid. During this test, the navigation system bugs up, leaving the gang strande
7. S04E07Crash CourseAugust 20, 2007 9.0Jeremy decides to teach Odd, Ulrich, and Yumi how to use the Supercomputer in case he or Aelita are unable to, being X.A.N.A.'s favorite tar
8. S04E08ReplikaAugust 21, 2007 9.0The group travels to one of X.A.N.A.'s replica sectors in the Digital Sea. Meanwhile, Aelita and Odd get into a fight after Odd's desire to
9. S04E09I'd Rather Not Talk About ItAugust 22, 2007 9.0The group turns to Jim for training, so they can be better prepared to fight against X.A.N.A.. However, things go bad when X.A.N.A. possesse
10. S04E10Hot ShowerAugust 23, 2007 9.0When a comet passes near Earth, X.A.N.A. uses a laser-equipped military satellite to split it into chunks, simultaneously aiming the bulk of
11. S04E11The LakeAugust 24, 2007 9.0Jeremy, 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
12. S04E12Lost at SeaAugust 27, 2007 10.0Hiroki steals Yumi's diary and Ulrich finds it. Meanwhile, in a new attempt to free William from X.A.N.A.'s evil clutches, Jeremy creates a
13. S04E13Lab RatAugust 28, 2007 9.0Jeremie has perfected his "Teleportation" process, allowing him to send his friends to the location of Xana's supercomputer in the real worl
14. S04E14Bragging RightsAugust 29, 2007 9.0Having failed to destroy X.A.N.A.'s supercomputer in the Amazon, the group sets out to finish the job. Meanwhile, Odd's bragging gets the be
15. S04E15Dog Day AfternoonAugust 29, 2007 9.0Odd tries to take Kiwi to Lyoko, but ends up absorbing him instead. As a result, Odd slowly begins to take on dog traits, such as enhanced s
16. S04E16A Lack of GoodwillAugust 30, 2007 9.0Jeremy has developed a program to make the William clone smarter, but the learning curve is still problematic, as it tries to fling a glass
17. S04E17Distant MemoryAugust 31, 2007 9.0It's holiday time at Kadic and everyone is headed home. Aelita, however, has no home to go to. As she watches over Lyoko, she gets a message
18. S04E18Hard LuckSeptember 8, 2007 9.0When Odd breaks a mirror, a little bad luck follows and jinxes him everywhere, even on Lyoko. A bug in his virtual avatar spreads to Yumi an
19. S04E19Guided MissileSeptember 15, 2007 9.0Jeremy wins a contest to take a flight in an armed fighter jet, even though it is Odd who entered him into the contest. However, just before
20. S04E20Kadic BombshellSeptember 22, 2007 9.0When Sissi's pen pal from Iceland, Brynja Heringsdötir, arrives at the school, all the boys swoon over her, making Sissi envious. When Brynj
21. S04E21Canine ConundrumSeptember 29, 2007 9.0When Kiwi's mindless destruction becomes too much for the group to bear, they force Odd to keep him at the factory. As Odd drops him off, XA
22. S04E22A Space OddityOctober 6, 2007 10.0Because of a surprise dorm inspection, Odd has to convince Yumi to keep Kiwi at her house. Jeremie, meanwhile, has located the next Replika,
23. S04E23Cousins Once RemovedOctober 13, 2007 9.0Jeremie's cousin, Patrick, comes to visit. Jeremie isn't entirely happy about it, since Patrick is "super cool" compared to him. Discovering
24. S04E24Music to Soothe The Savage BeastOctober 20, 2007 9.0Aelita's first concert with the Subdigitals is coming up, but Aelita's stage fright threatens to get the better of her. Odd meanwhile, has t
25. S04E25Wrong ExposureOctober 27, 2007 9.0Aelita finds a photo of herself with Franz Hopper at the Hermitage, with a mathematical equation in the background. Jeremie discovers that t
26. S04E26Bad ConnectionNovember 3, 2007 10.0Odd is presenting one of his films, but is unhappy because his parents are coming. According to him, they never find fault in anything he do
27. S04E27Cold SweatNovember 3, 2007 10.0When an embarrassing picture of Yumi is printed in the Kadic newspaper, she turns to Odd as the source. He manages to get Ulrich to take the
28. S04E28Down to EarthNovember 3, 2007 10.0In order to defeat XANA, whom they have vastly underestimated, Jeremie plans to design another multi-agent system to combat him. That, howev
29. S04E29Fight to the FinishNovember 10, 2007 10.0With the Skid gone and XANA's Replikas at unmanageable numbers, Jeremie continues work on his multi-agent system. Meanwhile, Aelita has nigh
30. S04E30EchoesNovember 10, 2007 10.0With their mission completed, the group looks back on all their fond memories of Lyoko. Sissi, meanwhile, plants a tracking device on Ulrich

Season 4 ranked & reviewed