Code Lyoko

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.

Last Updated: 10/23/2022Network:Cartoon Network
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Exploration
star
7.92
12 votes

#1 - 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.

Watch Now:AmazoniTunes
A Bad Turn
star
7.91
11 votes

#2 - 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.

Watch Now:Amazon
Fight to the Finish
star
7.83
12 votes

#3 - 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.

Watch Now:Amazon
Frontier
star
7.80
15 votes

#4 - 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.

The Pretender
star
7.71
7 votes

#5 - The Pretender

Season 3 - Episode 6 - Aired 10/14/2006

Yumi's classmate Johnny has a crush on her and won't let her out of his site, making it hard to help her friends battle the swarm of birds XANA sent to attack them. When she gets hurt the warriors must go back in time in order to save her.

Watch Now:Amazon
Code: Earth
star
7.63
16 votes

#6 - 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.

Watch Now:Amazon
Sabotage
star
7.63
8 votes

#7 - 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.

Watch Now:Amazon
The Robots
star
7.61
44 votes

#8 - The Robots

Season 1 - Episode 20 - Aired 1/14/2004

During a school robot competition, X.A.N.A. 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 deactivate the tower.

Watch Now:Amazon
Distant Memory
star
7.60
10 votes

#9 - 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.

Watch Now:Amazon
Cousins Once Removed
star
7.60
10 votes

#10 - 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.

Watch Now:Amazon
Wrong Exposure
star
7.60
10 votes

#11 - 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.

Watch Now:Amazon
Marabounta
star
7.58
12 votes

#12 - Marabounta

Season 2 - Episode 10 - Aired 11/2/2005

Jeremy uses lessons from Franz Hopper's journal to create Marabounta, a program designed to combat XANA's monsters. But when his own creation turns against him, Jeremy must combine forces with XANA to defeat the monster.

Watch Now:AmazoniTunes
Opening Act
star
7.57
7 votes

#13 - Opening Act

Season 4 - Episode 3 - Aired 8/30/2007

The drummer for a famous rock group, The Subdigitals, visits Kadic in search of young musical talent. Aelita wants to show off her skills, but XANA's attempts to kidnap her might prevent her musical dreams from coming true.

Watch Now:AmazoniTunes
A Great Day
star
7.54
13 votes

#14 - 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.

Watch Now:AmazoniTunes
Mister Puck
star
7.54
13 votes

#15 - 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.

Watch Now:AmazoniTunes
Saint Valentine's Day
star
7.53
15 votes

#16 - Saint Valentine's Day

Season 2 - Episode 6 - Aired 10/5/2005

Aelita receives a necklace which she believes is from Jeremy but is actually a poisoned gift from XANA. She puts it on and becomes powerless to resist the urge to go to Lyoko where XANA's trap awaits her.

Watch Now:iTunes
Just in Time
star
7.50
18 votes

#17 - 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.

Temporary Insanity
star
7.50
8 votes

#18 - 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.

Watch Now:Amazon
Uncharted Territory
star
7.46
13 votes

#19 - Uncharted Territory

Season 2 - Episode 2 - Aired 9/7/2005

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. It is discovered that Franz Hopper was in fact a former teacher at Kadic. After being teased by Sissi, Aelita retreats to Lyoko but gets lost. Jeremie finds her in a previously undiscovered fifth sector of Lyoko, The Carthage Region.

Watch Now:AmazoniTunes
The Chips Are Down
star
7.44
9 votes

#20 - The Chips Are Down

Season 2 - Episode 9 - Aired 10/26/2005

When he learns Yumi may be leaving, Ulrich secretly goes back in time, in order to help her family, even though he knows this will make XANA stronger. Jeremy and Yumi decide he's gone too far and consider removing him from the group.

Watch Now:AmazoniTunes
Franz Hopper
star
7.44
9 votes

#21 - Franz Hopper

Season 2 - Episode 23 - Aired 2/1/2006

A man claiming to be Franz Hopper shows up at the computer lab and blames Jeremy for destroying his diary - the only hope of defeating XANA. With everyone now mad at Jeremy, XANA acts quickly to lure Aelita back to Lyoko.

Watch Now:Amazon
Straight to Heart
star
7.44
9 votes

#22 - Straight to Heart

Season 3 - Episode 1 - Aired 9/9/2006

On her way to the forest as part of a science class field trip, Yumi becomes the target of the driver and the passengers on the school bus who all have been possessed by X.A.N.A. Meanwhile, Odd decides to compete against Jeremie and Herv in an election for student class representative.

Watch Now:Amazon
False Lead
star
7.44
9 votes

#23 - False Lead

Season 3 - Episode 4 - Aired 9/30/2006

When Xana hacks into a weapon's manufacturing computer network and leaves a paper trail pointing to Jeremie, government agents arrive at the school looking for him. Then, the whole gang arrive at the factory. When they end up tracking Jeremie to the factory, Xana possesses them for an attack on the supercomputer itself in The Ice Sector, and in The Mountain Sector.

Watch Now:Amazon
The Trap
star
7.44
16 votes

#24 - 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.

Watch Now:Amazon
Ultimatum
star
7.40
10 votes

#25 - Ultimatum

Season 2 - Episode 15 - Aired 11/30/2005

After Xana possesses the principal of the school and kidnaps Odd and Yumi, he gives Jeremie an ultimatum: deliver Aelita to the Scyphozoa or sacrifice Odd and Yumi. However, Jeremie and Aelita go to Sissi for help and Sissi agrees to be tempoarily part of the group to help save her father and eradicate Xana.

Watch Now:Amazon

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