Season 4 Episodes : Code Lyoko (2003)

Code Lyoko (2003)
1. William Returns

13 Aug '07

Using the data that Franz Hopper gave them, Jeremie and Aelita succeed in recreating Lyoko, which now holds only Sector Five. Soon after, William is devirtualized, and seems perfectly normal. Sissi decides to make herself "editor-in-chief" of Kadic News, much to Milly and Tamiya's dismay. She soon barges into Aelita's room to interview her and is stopped by William. As soon as William makes Sissi, timay and milly leave,William kidnaps Aelita and takes her to Lyoko. William leads Aelita out of

Code Lyoko (2003)
2. Double Take

14 Aug '07

In order to compensate for all of William, while under XANA's control, Jeremie sets to work designing new equipment for his friends and recreating Lyoko. In order to buy himself time to do this, he activates a tower and uses it to create a a clone of his own to attend class in his place. Meanwhile, William's absence is drawing attention, from both the principal and his father. While Jeremie's Clone is impressing Jim outside, William appears on Lyoko and tries to put the tower under XANA's

Code Lyoko (2003)
3. Opening Act

30 Aug '07

Aelita finds a photo of herself with Franz Hopper at the Hermitage, with a mathematical equation in the background. Jeremie discovers that the program works as a reset feature to Lyoko, something not too helpful but useful nonetheless. Meanwhile, Odd, in an attempt to impress a girl in photography class, inadvertently sends the photo to Sissi, who in turn shows it to her father. He questions the group about it, with Jeremie pointing out that Aelita would obviously be twenty-four by now if she

Code Lyoko (2003)
4. Wreck Room

15 Aug '07

Jim'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 tries out, and Aelita turns out to be the one Chris is looking for. However, circumstances make sure that Chris doesn't realize who Aelita is, and XANA's clone of him only complicates matters, kidnapping Aelita and sending her to Lyoko. Jim and Chris manage to involve themselves in their search for Aelita, and end up battling the clone while the rest of the

Code Lyoko (2003)
5. Skidbladnir

16 Aug '07

There is a new recreation room at Kadic and William's clone is put in charge of it. Meanwhile, Jeremie has developed a program to get the real William out of Lyoko. However, the program malfunctions and bugs up the tower, allowing XANA to take it over while Aelita cannot shut it down. As the William clone lashes out at the group, the real William is on Lyoko to keep the tower under XANA's control. Jeremie manages to repair the tower in time for Aelita to reset it, restoring the clone to working

Code Lyoko (2003)
6. Maiden Voyage

17 Aug '07

The new "submarine" (as Jeremie calls it) is almost complete, the last step being a secondary program that needs to be run by 4:00 p.m. the next day. However, when Aelita and Jeremie stay up late to set the program up, they are caught and given detention. William takes the opportunity to attack the incomplete sub, forcing Yumi to run the supercomputer in Jeremie's absence. Odd and Ulrich are unable to handle the situation, but Jeremie and Aelita are able to sneak out in time to help. Aelita is

Code Lyoko (2003)
7. Crash Course

20 Aug '07

The gang manages to convince Jeremie to let them test out the Skid. During this test, the navigation system bugs up, leaving the gang stranded in the digital sea. Jeremie runs to his room to fetch the backup programs, but forgets that it's Fire Safety Day and runs into several teachers, eventually having to scale the roof to get to his room. Meanwhile, the Skid stumbles upon another Lyoko and is attacked by two eel-like monsters. Jeremie is able to repair the navigation system and bring his

Code Lyoko (2003)
8. Replika

21 Aug '07

Jeremie decides to teach Odd, Ulrich, and Yumi how to use the supercomputer in case he or Aelita are unable to, being XANA's favorite target. During the lesson, Jeremie is attacked by one of XANA's polymorphic clones, leaving the others to operate the supercomputer without help. Aelita is at the final audition with the Subdigitals, competing against two other candidates, and thus cannot be contacted. To make matters worse, the clone heads for her after dealing with Jeremie. Using what they

Code Lyoko (2003)
9. I'd Rather Not Talk About It

22 Aug '07

The group travels to one of XANA's Lyoko replicas in the digital sea. Meanwhile, Aelita and Odd get into a fight after Odd's desire to sleep in gets them both in trouble. Furthermore, their arguing inadvertently leads Nicolas and Herve into the factory, where Jeremie is forced to distract them while the group explores the Lyoko copy, which consists entirely of the Forest Region. On the Lyoko replika, William and a pair of Megatanks arrive to destroy the Skid, the destruction of which would cut

Code Lyoko (2003)
10. Hot Shower

23 Aug '07

The group turns to Jim for training so they can be better prepared to fight XANA. However, things go bad when XANA possesses a boar to attack them with, forcing them to put their training to good use to avoid it. Furthermore, XANA sends William and a group of Mantas to attack Lyoko's core. Jeremie stays behind to help Jim while the others repel the attack. Jeremie risks his life to save Jim when the two encounter their attacker in a cave, and Aelita deactivates the tower in time to save them

Code Lyoko (2003)
11. The Lake

24 Aug '07

When a comet passes near Earth, XANA uses a laser-equipped military satellite to split it into chunks, simultaneously aiming the bulk of it directly at the factory. Aelita, Odd, and Ulrich are exploring the digital sea at the time, and XANA traps them with a firewall to prevent them from stopping the attack. Meanwhile, Yumi is stuck at school and, when informed of the attack, works to evacuate the school. Jeremie tells Yumi to connect his laptop to an antenna to tap into the military satellite

Code Lyoko (2003)
12. Lost at Sea

27 Aug '07

Jeremie, 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 water-based plantlife. Yumi, not part of the class, remains behind to sit through two important exams. Jeremie's fears about XANA attacking at such an inopportune moment are realized when XANA creates an electricity-blasting sludge that attacks anyone who approaches the shore. Yumi is forced to go to Lyoko alone, and during her fight with William, is

Code Lyoko (2003)
13. Lab Rat

28 Aug '07

Jeremie has perfected his "Teleportation" process, allowing him to send his friends to the location of Xana's supercomputer in the real world to destroy it. He uses it on Aelita and Odd first, sending them to the jungle laboratory containing the supercomputer. As they explore, they find that XANA is constructing cybernetic spiders with the help of a team of possessed scientists. Before they can stop him, however, William manages to sever their connection to the real world, bringing them back to

Code Lyoko (2003)
14. Bragging Rights

29 Aug '07

Jeremie has perfected his "Teleportation" process, allowing him to send his friends to the location of Xana's supercomputer in the real world to destroy it. He uses it on Aelita and Odd first, sending them to the jungle laboratory containing the supercomputer. As they explore, they find that XANA is constructing cybernetic spiders with the help of a team of possessed scientists. Before they can stop him, however, William manages to sever their connection to the real world, bringing them back to

Code Lyoko (2003)
15. Dog Day Afternoon

29 Aug '07

Having failed to destroy XANA's supercomputer in the previous episode, the group sets out to finish the job. Meanwhile, Odd's bragging gets the better of him, and he makes a bet with Ulrich not to brag for 24 hours. However, circumstances conspire to constantly put him in the spotlight, and when he ultimately both defeats William singlehandedly and destroys the supercomputer in the real world, Odd becomes convinced that being a braggart is something he can be proud of.

Code Lyoko (2003)
16. A Lack of Goodwill

30 Aug '07

Odd 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 smell and scratching himself with his foot. While Jeremie works on separating the two, XANA possesses a biker gang to attack Yumi. When Ulrich and Aelita arrive to Lyoko, they are confronted by William and three Tarantulas. Jeremie manages to split Odd and Kiwi while Aelita deactivates the tower.

Code Lyoko (2003)
17. Distant Memory

31 Aug '07

Jeremie has developed a program to make the William clone smarter, but the learning curve is still problematic, as it tries to fling a glass into the air from a fork. Milly and Tamiya, overhearing the group's conversation about the clone, decide to ask him personally. The clone, having never been told to keep the information a secret, reveals everything to them, and even takes them to the factory. Meanwhile, Jeremie plans a mission to the next Replika, a copy of the Desert Sector. During the

Code Lyoko (2003)
18. Hard Luck

08 Sep '07

It'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 from Franz Hopper, who has constructed a simulation bubble of their mountain home on Lyoko. Though happy to see her father, Aelita quickly learns that the entire thing is a trick from xana - her father is just a mirage, and William is there waiting for her to throw Aelita in the digital sea Williams say(impossible to escape this bubble as it is your prison)

Code Lyoko (2003)
19. Guided Missile

15 Sep '07

When 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 and Aelita, causing annoying pauses and random devirtualization in the copy of the Desert Sector. Meanwhile, at the site of the Replika supercomputer, Xana materializes Kankrelats in the real world to stop Ulrich and Yumi. Despite the bug, their mission to destroy XANA's next Replika ends in success, this time by Ulrich, and Odd's luck returns soon afterwards.

Code Lyoko (2003)
20. Kadic Bombshell

22 Sep '07

Jeremie wins a contest to take a flight in an armed fighter jet, even though it was Odd who entered him into the contest in the first place. However, just before takeoff, XANA possesses the jet and sends it to destroy the factory and kill Jeremie by forcing it to crash. As it closes in, Aelita, Odd, Ulrich, and Yumi struggle against William, who devirtualizes them one by one in his attempt to throw Aelita into the digital sea. Ulrich is the one to come out on top in a blade to blade fight with

Code Lyoko (2003)
21. Canine Conundrum

29 Sep '07

When 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, XANA possesses Jeremie's Kiwi Two robot, turning it into an army of self-replicating attack dogs. The dogs attack Yumi and Ulrich, among other children, during Jim's Pencak Silat class. After Aelita deactivates the tower and a return trip erases the incident, the group decides that the regular Kiwi isn't that bad, after all.

Code Lyoko (2003)
22. A Space Oddity

06 Oct '07

Because of a surprise dorm inspection, Odd has to convince Yumi to keep Kiwi at her house. Jeremie, meanwhile, has located the next Replika, a copy of Sector Five. Its supercomputer is located on a newly-built space station orbiting Earth. While Odd and Yumi work to disable it, Aelita and Ulrich work to disable the Replika's defenses of Sector Five, which threaten to destroy the Skid. To make matters worse, the supercomputer is guarded by a trio of floating spheres that can grow spikes and melt

Code Lyoko (2003)
23. Cousins Once Removed

13 Oct '07

Jeremie's cousin, Patrick, comes to visit. Jeremie isn't entirely happy about it, since Patrick is "super cool" compared to him. Discovering another Replika, Jeremie and his friends plan a mission to destroy it, leaving Sissi alone with Patrick. She is able to convince him to let Herve rummage through Jeremie's computer files. Herve discovers Aelita's forged documents and the program running the Skid, his efforts to decipher it inadvertently draining the Skid's power. To make matters worse, XANA

Code Lyoko (2003)
24. Music to Soothe The Savage Beast

20 Oct '07

Aelita's first concert with the Subdigitals is coming up, but Aelita's stage fright threatens to get the better of her. Odd meanwhile, has to find an extra ticket so he can bring a date. When the concert finally starts, XANA attacks, possessing Sophia, in order to kidnap Aelita. He also possesses Milly and Tamiya for some extra help. While Ulrich battles the two reporters, the others work to shut down the tower, all while the Subdigitals' music plays in the background. Once the threat is over,

Code Lyoko (2003)
25. Wrong Exposure

27 Oct '07

Aelita finds a photo of herself with Franz Hopper at the Hermitage, with a mathematical equation in the background. Jeremie discovers that the program works as a reset feature to Lyoko, something not too helpful but useful nonetheless. Meanwhile, Odd, in an attempt to impress a girl in photography class, inadvertently sends the photo to Sissi, who in turn shows it to her father. He questions the group about it, with Jeremie pointing out that Aelita would obviously be twenty-four by now if she

Code Lyoko : Season 4

1. William Returns

2. Double Take

3. Opening Act

4. Wreck Room

5. Skidbladnir

6. Maiden Voyage

7. Crash Course

8. Replika

9. I'd Rather Not Talk About It

10. Hot Shower

11. The Lake

12. Lost at Sea

13. Lab Rat

14. Bragging Rights

15. Dog Day Afternoon

16. A Lack of Goodwill

17. Distant Memory

18. Hard Luck

19. Guided Missile

20. Kadic Bombshell

21. Canine Conundrum

22. A Space Oddity

23. Cousins Once Removed

24. Music to Soothe The Savage Beast

25. Wrong Exposure