The BEST episodes of Code Lyoko
Every episode of Code Lyoko ever, ranked from best to worst by thousands of votes from fans of the show. The best episodes of Code Lyoko!
Code Lyoko tells the story of a group of students who uncover a parallel universe called Lyoko inside a super-computer, which entraps a malevolent sentient AI called X.A.N.A.
#1 - Code: Earth
Season 1 - Episode 25 - Aired 2/18/2004
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 and he ends up causing Jeremie to injure his ankle while running away from him down stairs in the school.
#2 - Aelita
Season 3 - Episode 5 - Aired 10/7/2006
Aelita gets mad at Jeremie and she and Odd go into Lyoko without telling anybody. On Lyoko, Xana creates a diversion to get everybody to deactivate the tower in The Mountain Sector while the monsters worked on destroying the core of Lyoko. Jeremie and Aelita find a strand of DNA that belongs to Franz Hopper, indicating he may be still alive.
#3 - Exploration
Season 2 - Episode 3 - Aired 9/14/2005
Our heroes discover Sector 5 and seek to uncover some of its secrets, but first they must overcome its many traps. Meanwhile, Yumi's parents decide to visit, and she has a tough time getting away in order to help her friends in Lyoko.
#4 - False Start
Season 1 - Episode 26 - Aired 2/25/2004
Aelita's materialization program has worked, and she's now living on Earth. When Jeremie pulls the plug on Lzoko, Aelita faints. Jeremie believes that a virus was given to her by X.A.N.A. while he was bringing her to Earth which has linked her to the supercomputer, preventing the group from shutting it off. X.A.N.A. brings his Roachters into the real world in mass numbers and unleashes them on the school.
#5 - Distant Memory
Season 4 - Episode 17 - Aired 8/31/2007
While everyone is gone for the winter holidays, Aelita stays behind to watch for XANA. But she receives a message from her long-lost father inviting her to join him in the virtual world, and she accepts, realizing too late that it's a trap.
#6 - Routine
Season 1 - Episode 22 - Aired 1/28/2004
After many X.A.N.A. attacks in a row, Ulrich starts to get tired of fighting. He also questions his relationship with Yumi and if she feels the same way about him. X.A.N.A. activates a tower without disturbing Earth, Jeremie forces Ulrich, Odd, and Yumi all to go to Lyoko to deactivate the tower. After being virtualized, a virus infection occurs on Lyoko because X.A.N.A. sabotages the Devirtualization Program, meaning if the group is devirtualized, they will permanently perish.
#7 - Triple Trouble
Season 3 - Episode 11 - Aired 11/6/2006
Jeremy gives Odd the ability to teleport himself across short distances within Lyoko, but the initial test results in three Odds being created. The clones don't get along so well and have split up in town while XANA launches a new attack.
#8 - A Bad Turn
Season 2 - Episode 13 - Aired 11/16/2005
Ulrich and William battle to impress Yumi during Drivers Ed at school, but they must find a way to put aside their differences and work together when XANA unleashes an army of Krabes in the real world.
#9 - Frontier
Season 1 - Episode 19 - Aired 1/7/2004
When Jeremie yells at Aelita, he tries to go to Lyoko to apologize. Unfortunately, while Yumi is transferring him, she makes a scanner error, which leaves him trapped in a virtual limbo between Lyoko and the real world, so Aelita has to retrieve data to recover Jeremie without support in order to bring Jeremie back, but when she gets to the Mountain Sector, there are a couple of Blocks guarding the tower.
#10 - Wrong Exposure
Season 4 - Episode 25 - Aired 10/27/2007
Aelita's secret past is in danger of being revealed when Sissi gets a hold of an old photo of Aelita with Franz Hopper. Meanwhile, Jeremy needs the picture because of the mathematical formulas written on the blackboard in the background.
#11 - Just in Time
Season 1 - Episode 13 - Aired 11/26/2003
Jeremie materializes a single hair of Aelita's. 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 X.A.N.A. is responsible for the damage being caused to the school by using ultrasonic sound waves, which continues to get worse.
#12 - Mister Puck
Season 2 - Episode 5 - Aired 9/28/2005
Aelita's frightening visions at the Hermitage lead her to a strangely familiar plush toy. But when the toy is accidentally torn, a key is found, leading to a locker containing Franz Hopper's encrypted journal.
#13 - Final Round
Season 3 - Episode 13 - Aired 11/8/2006
Aelita and new warrior William are forced to battle XANA while the others attend to their schoolwork. But when XANA wins the battle and turns William against the others, they must act quickly to save Lyoko in their most difficult battle.
#14 - Cold Sweat
Season 4 - Episode 27 - Aired 11/3/2007
Odd and Yumi travel to polar Siberia on a mission, only to be confronted by William who has been sent by XANA to stop them. Meanwhile, Ulrich and Aelita confront XANA's latest creature, the massive Kolossus.
#15 - A Great Day
Season 2 - Episode 4 - Aired 9/21/2005
XANA gains the ability to go back in time and our heroes discover this power also makes him stronger, to the point where he can now control human beings. After XANA possesses Sissi, the heroes realize they must take action quickly.
#16 - Sabotage
Season 3 - Episode 9 - Aired 11/2/2006
When Xana sabotages the supercomputer, weird bugs begin cropping up in Lyoko. Since the attack keeps draining power from the supercomputer, Aelita purposefully wipes out The Ice Sector leaving The Mountain Sector left.
#17 - Temporary Insanity
Season 3 - Episode 8 - Aired 11/1/2006
Ulrich and Odd return from a mission on Lyoko, but XANA has infected them with a virus causing them to believe they are seeing monsters in the real world. Jeremy knows how to help them, but XANA has launched another attack in Sector 5.
#18 - Cruel Dilemma
Season 1 - Episode 6 - Aired 10/8/2003
Jeremie's materialization program for Aelita is finished, but is only good for one use. In turn, X.A.N.A. possesses two bulldozers and sets them on the factory to prevent Aelita's materialization from taking place. Odd goes to Lyoko while Ulrich tries to stop the bulldozers.
#19 - Fight to the Finish
Season 4 - Episode 29 - Aired 11/10/2007
In the ultimate battle against XANA, our heroes work with Franz Hopper to destroy the evil super computer forever. But first they must face everything XANA can throw at them.
#20 - The Trap
Season 1 - Episode 14 - Aired 12/3/2003
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, X.A.N.A. possesses the factory as a whole. X.A.N.A. traps Ulrich, Yumi and Sissi in the elevator and drops them to the bottom of the shaft.
#21 - Echoes
Season 4 - Episode 30 - Aired 11/10/2007
After finally defeating XANA, our heroes gather again to shut down the super computer, but find it hard to put an end to their lives of adventure. They may not have a choice though, when Sissi reveals their secret to the school headmaster.
#22 - Cold War
Season 2 - Episode 19 - Aired 1/18/2006
XANA takes control of the weather and sends temperatures plummeting so low that any outdoor exposure could cause breathing problems. Our heroes must come up with a plan to get to the factory and enter Lyoko to thwart their enemy.
#23 - Revelation
Season 2 - Episode 25 - Aired 2/8/2006
XANA tries to access a restricted area where Jeremy has stored all the data he's collected since the very beginning. Meanwhile, Yumi helps Odd, who has fallen into a trap on Lyoko, and Ulrich battles a spectre which is a clone of himself.
#24 - Skidbladnir
Season 4 - Episode 5 - Aired 8/16/2007
Jeremy and Aelita create a virtual ship capable of taking our heroes deep into the virtual world. But working late at night is against school rules and they receive detention, so XANA sets out to destroy the ship during their punishment.
#25 - Cousins Once Removed
Season 4 - Episode 23 - Aired 10/13/2007
Jeremy's cousin Patrick visits and problems arise when Patrick lets Herve look at Jeremy's computer. Our heroes' mission is soon compromised and Aelita's fake identity is uncovered. Only a trip back in time can fix this situation.