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Episode guide

Code Lyoko: Season 4

Poster for Code Lyoko Season 4

30 episodes · premiered Aug 13, 2007

Jeremy and Aelita must rebuild a new Lyoko to replace the one XANA maliciously destroyed at the end of the third season.

Code Lyoko: cast and where to watch

  1. Episode 1: William Returns Aug 13, 2007 · 23m 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…
  2. Episode 2: Double Take Aug 14, 2007 · 23m 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…
  3. Episode 3: Opening Act Aug 30, 2007 · 23m 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…
  4. Episode 4: Wreck Room Aug 15, 2007 · 23m There 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 real William out of Lyoko. However, the program…
  5. Episode 5: Skidbladnir Aug 16, 2007 · 23m The new virtual, submersible "submarine" (as Jeremy calls it) is almost complete, the last step being a secondary program that needs to be run by 4 PM the next day. However, when Aelita…
  6. Episode 6: Maiden Voyage Aug 17, 2007 · 23m The gang manages to convince Jeremy to let them test out the Skid. During this test, the navigation system bugs up, leaving the gang stranded in the digital sea. Jeremy runs to his room to…
  7. Episode 7: Crash Course Aug 20, 2007 · 23m Jeremy 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 targets. During the lesson, Jeremy is attacked by…
  8. Episode 8: Replika Aug 21, 2007 · 23m The 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 sleep in gets them both in trouble. Furthermore…
  9. Episode 9: I'd Rather Not Talk About It Aug 22, 2007 · 23m The 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. possesses a boar to attack them with, forcing them to…
  10. Episode 10: Hot Shower Aug 23, 2007 · 23m When 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 it directly at the factory. Aelita, Odd, and…
  11. Episode 11: The Lake Aug 24, 2007 · 23m Jeremy, 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 plant life. Yumi, not part of the…
  12. Episode 12: Lost at Sea Aug 27, 2007 · 23m Hiroki 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 program to find William in the Digital Sea. When…
  13. Episode 13: Lab Rat Aug 28, 2007 · 23m 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…
  14. Episode 14: Bragging Rights Aug 29, 2007 · 23m Having 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 better of him, and he makes a bet with Ulrich not…
  15. Episode 15: Dog Day Afternoon Aug 29, 2007 · 23m 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…
  16. Episode 16: A Lack of Goodwill Aug 30, 2007 · 23m Jeremy 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…
  17. Episode 17: Distant Memory Aug 31, 2007 · 23m 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…
  18. Episode 18: Hard Luck Sep 8, 2007 · 23m 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…
  19. Episode 19: Guided Missile Sep 15, 2007 · 23m Jeremy 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 takeoff, X.A.N.A. possesses the jet and sends…
  20. Episode 20: Kadic Bombshell Sep 22, 2007 · 23m When Sissi's pen pal from Iceland, Brynja Heringsdötir, arrives at the school, all the boys swoon over her, making Sissi envious. When Brynja takes an interest in Odd, he ends up showing…
  21. Episode 21: Canine Conundrum Sep 29, 2007 · 23m 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…
  22. Episode 22: A Space Oddity Oct 6, 2007 · 23m 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…
  23. Episode 23: Cousins Once Removed Oct 13, 2007 · 23m 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…
  24. Episode 24: Music to Soothe The Savage Beast Oct 20, 2007 · 23m 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…
  25. Episode 25: Wrong Exposure Oct 27, 2007 · 23m 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…
  26. Episode 26: Bad Connection Nov 3, 2007 · 23m Odd is presenting one of his films, but is unhappy because his parents are coming. According to him, they never find fault in anything he does, which he finds dissatisfying because he…
  27. Episode 27: Cold Sweat Nov 3, 2007 · 23m When 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 blame, however, causing tension between him and…
  28. Episode 28: Down to Earth Nov 3, 2007 · 23m In order to defeat XANA, whom they have vastly underestimated, Jeremie plans to design another multi-agent system to combat him. That, however, is still under development. In more…
  29. Episode 29: Fight to the Finish Nov 10, 2007 · 23m With the Skid gone and XANA's Replikas at unmanageable numbers, Jeremie continues work on his multi-agent system. Meanwhile, Aelita has nightmares about her father being killed by XANA. As…
  30. Episode 30: Echoes Nov 10, 2007 · 23m With their mission completed, the group looks back on all their fond memories of Lyoko. Sissi, meanwhile, plants a tracking device on Ulrich in order to discover their secret. When it…