The WORST episodes of Code Lyoko

Every episode of Code Lyoko ever, ranked from worst to best by thousands of votes from fans of the show. The worst 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: 1/16/2023Network:France 3
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Lyoko Minus One
star
5.57
37 votes

#1 - Lyoko Minus One

Season 3 - Episode 2 - Aired 9/16/2006

XANA tries to destroy all of the surface sectors on Lyoko -- the only way for our heroes to access Sector 5. They need Jeremy's help getting directly into Sector 5, but he's busy running for election to the Academic Council, against Odd!

Watch Now:Amazon
Bragging Rights
star
6.40
10 votes

#2 - Bragging Rights

Season 4 - Episode 14 - Aired 8/29/2007

Our heroes return to the jungle to destroy the other super computer but are met on their way by waves of mechanical killer spiders. Meanwhile, Odd has a hard time winning a bet with Ulrich that he will stop bragging for 24 hours.

Watch Now:Amazon
Lost at Sea
star
6.44
9 votes

#3 - Lost at Sea

Season 4 - Episode 12 - Aired 8/27/2007

Hiroki steals Yumi's diary and Ulrich finds it. During an attempt to rescue William and battle XANA's monsters, Yumi becomes stranded in the Digital Sea.

Seeing Is Believing
star
6.45
22 votes

#4 - Seeing Is Believing

Season 1 - Episode 2 - Aired 9/10/2003

Group needs a drummer for a traditional rock band. Nicolas turns out to be the best, but Odd doesn't want anything to do with him. Meanwhile, X.A.N.A. tries to overload a nuclear power plant by storing electricity in a transformer and unleashing it on the plant all at once. Unsure if they can stop such an event, , they decide to tell the authorities.

Watch Now:iTunes
Is Anybody Out There?
star
6.50
6 votes

#5 - Is Anybody Out There?

Season 2 - Episode 22 - Aired 1/25/2006

After hearing strange noises, Sissi conducts a séance at the school. XANA takes advantage of this and sends out a ghost, sending panic across the campus. Our heroes know this is the work of XANA, but can they deactivate the tower in time?

Watch Now:Amazon
Down to Earth
star
6.57
7 votes

#6 - Down to Earth

Season 4 - Episode 28 - Aired 11/3/2007

Our heroes return to Siberia to free William from XANA's clutches, but first they must defeat the Kolossus and an army of robots. They better hurry too, because William's parents are visiting and his clone won't fool them for long.

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I'd Rather Not Talk About It
star
6.70
10 votes

#7 - I'd Rather Not Talk About It

Season 4 - Episode 9 - Aired 8/22/2007

Jeremy convinces the group to attend a commando camp in order to get in better shape for their battles. Soon enough, XANA attacks, with Jeremy and Jim battling in the real world and everyone else using their new skills in Lyoko.

Watch Now:AmazoniTunes
Double Take
star
6.71
7 votes

#8 - Double Take

Season 4 - Episode 2 - Aired 8/14/2007

Jeremy creates a clone of himself to attend class so he can spend more time trying to get William out of Lyoko. But when XANA wrests control of the tower used to create the clone, the new Jeremy poses a very serious threat to everyone.

Watch Now:AmazoniTunes
Zero Gravity Zone
star
6.73
15 votes

#9 - Zero Gravity Zone

Season 1 - Episode 21 - Aired 1/21/2004

Just before an official school soccer game, X.A.N.A. starts nullifying gravity by creating electromagnetic fields around specific areas. Ulrich is unable to help stop X.A.N.A. this time around, instead needing to impress his parents, who will be attending the game. The others have to stop X.A.N.A. before the entire school is sent into orbit.

Common Interest
star
6.77
13 votes

#10 - Common Interest

Season 2 - Episode 11 - Aired 11/9/2005

When the supercomputer's uranium power source begins to fail, Xana is forced to possess a local criminal named Peter Duncan to replace it. The supercomputer's periodic shutdowns threaten not only Xana, but also Aelita, whose heart stops beating with each shutdown.

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The Lake
star
6.78
9 votes

#11 - The Lake

Season 4 - Episode 11 - Aired 8/24/2007

During a class field trip to an island in the middle of a lake, XANA conjures an aquatic monster to trap the students. However, Yumi, who stayed behind to do her schoolwork, is able to enter Lyoko where she must face William one-on-one.

Watch Now:Amazon
Amnesia
star
6.81
16 votes

#12 - Amnesia

Season 1 - Episode 17 - Aired 12/24/2003

When Susan gives a lesson on nanotechnology, she has small machine designed to produce the little robots as an example. X.A.N.A. has infected the machine, so when they find it filled with gel, Odd carelessly ends up pushing Ulrich's face into a small scoop of it. Later on, Ulrich gets a headache and faints. When he wakes up, his memory is gone.

Vertigo
star
6.88
8 votes

#13 - Vertigo

Season 2 - Episode 18 - Aired 1/11/2006

Ulrich's fear of heights is embarrassingly uncovered in gym class. Upset, he goes off to brood in the woods and Yumi and Odd try cheer him up. However, all is quickly forgotten when XANA dispatches a pack of wolves to wipe them out!

Watch Now:Amazon
Hot Shower
star
6.89
9 votes

#14 - Hot Shower

Season 4 - Episode 10 - Aired 8/23/2007

XANA uses a military laser to send a comet hurdling towards Earth. Meanwhile, Ulrich, Odd and Aelita are deep in the virtual world and unable to return quickly, leaving Yumi, Hiroki and Johnny to somehow save the world.

Watch Now:AmazoniTunes
Laughing Fit
star
6.93
15 votes

#15 - Laughing Fit

Season 1 - Episode 15 - Aired 12/10/2003

In class, Susan teaches the class about nitrous oxide, more commonly known as laughing gas, and its effects. It can be dangerous if not neutralized by water quickly. During a school production of Romeo and Juliet, X.A.N.A. possesses the laughing gas in the science room and uses it to attack the gang so they would laugh themselves to death.

Claustrophobia
star
6.93
46 votes

#16 - Claustrophobia

Season 1 - Episode 16 - Aired 12/17/2003

Theo takes an interest in Sissi, Hervé becomes jealous and tries to get him expelled. X.A.N.A. possesses the cafeteria during lunch, trapping most of the students inside its electrified walls. Jeremie and Yumi leave the cafeteria before this takes place. Now Yumi has to get Aelita to the tower by herself before the cafeteria collapses in on itself.

A Space Oddity
star
7.00
7 votes

#17 - A Space Oddity

Season 4 - Episode 22 - Aired 10/6/2007

Yumi and Odd travel into outer space on a mission to destroy a newly-discovered super computer with a dangerous defense system. Meanwhile, Yumi's family cares for Odd's dog during a surprise dorm inspection at school.

Watch Now:Amazon
Dog Day Afternoon
star
7.00
8 votes

#18 - Dog Day Afternoon

Season 4 - Episode 15 - Aired 8/29/2007

Odd tries to take Kiwi to Lyoko, but ends up absorbing him instead. As a result he begins to take on dog traits. While Jeremie works on separating the two, XANA possesses a biker gang to attack Yumi.

Watch Now:Amazon
Double Trouble
star
7.00
6 votes

#19 - Double Trouble

Season 3 - Episode 12 - Aired 11/7/2006

The students' grades are becoming affected by all the time they've spent fighting XANA, so they suggest adding William to the team, but Yumi is against it. However, the super computer's latest attack may be bad enough to change her mind.

Watch Now:Amazon
Contact
star
7.00
6 votes

#20 - Contact

Season 2 - Episode 24 - Aired 2/1/2006

When Sissi begins acting strangely, it's believed she is being controlled by XANA. But when she doesn't seem interested in harming the heroes, they investigate further and discover it's Franz Hopper trying to communicate with them.

Watch Now:Amazon
A Fine Mess
star
7.00
7 votes

#21 - A Fine Mess

Season 2 - Episode 16 - Aired 12/14/2005

After another successful mission on Lyoko, our heroes rematerialize, but the program has malfunctioned and switched Yumi and Odd's bodies. It seems funny at first, until they realize if not reversed, they could both disintegrate for good.

Watch Now:Amazon
Holiday in the Fog
star
7.00
19 votes

#22 - Holiday in the Fog

Season 1 - Episode 3 - Aired 9/17/2003

After Jeremie and Ulrich paint funny graffiti of Jim on aschool wall, Sissi overhears him talking about X.A.N.A. She gets her father to let her stay there during the vacation so she can discover the group's secret. X.A.N.A. takes the opportunity to possess several barrels full of poison and turns the poison into a deadly, living gas.

Watch Now:iTunes
Maiden Voyage
star
7.03
37 votes

#23 - Maiden Voyage

Season 4 - Episode 6 - Aired 8/17/2007

Jeremy launches the virtual ship Skidbladnir on its maiden voyage. But when a problem arises, Jeremy needs to get his notes from his dorm room and the school is in lockdown for a fire drill, leaving our heroes to face a new menace.

Watch Now:AmazoniTunes
Cruel Dilemma
star
7.06
16 votes

#24 - 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.

Watch Now:iTunes
Rock Bottom
star
7.07
14 votes

#25 - Rock Bottom

Season 1 - Episode 23 - Aired 2/4/2004

During a vacation period at the school, the group plans to have a party at Yumi's house. Odd promises to have a DJ at the party. This DJ, named Samantha Knight, is also his girlfriend, who goes to another school. After meeting up, she has Odd take her to the computer room. Once they arrive, she tries to steal a laptop, since she's too poor to afford one. Odd stops her, but ends up being caught by Jim. Meanwhile, X.A.N.A. causes the ground under the city to melt, making all the buildings sink.

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