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 - 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.
#2 - 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.
#3 - 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.
#4 - 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.
#5 - 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.
#6 - Crash Course
Season 4 - Episode 7 - Aired 8/20/2007
Jeremy tries to teach his reluctant friends how to operate the computer in order to enter Lyoko. While Aelita is away at a music audition, XANA launches an attack and renders Jeremy unconscious, leaving the others to remember their lesson.
#7 - 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.
#8 - 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.
#9 - A Lack of Goodwill
Season 4 - Episode 16 - Aired 8/30/2007
Our heroes travel to the desert to destroy a hidden super computer but their trip is cut short when the real William arrives in the computer lab. Meanwhile, Jeremy tries to prevent William's clone from being discovered by Milly and Tamiya.
#10 - 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.
#11 - 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.
#12 - Ghost Channel
Season 1 - Episode 24 - Aired 2/11/2004
After battle against X.A.N.A. Ulrich, Odd, and Yumi are nowhere to be found. They, however, do not see anything wrong with where they are. X.A.N.A. has trapped them in a world of its own design, which is fashioned after the school to ease their suspicions. However, the world that Ulrich, Odd, and Yumi are in appears to have some glitches in it. Jeremie virtualizes himself into that world to save the others.
#13 - Satellite
Season 1 - Episode 9 - Aired 10/29/2003
During class, everyone's cell phones suddenly go off, and all of them are confiscated. Sissi is not happy about this and organizes a protest in response. Yumi joins the protest, since having cell phones is a necessary part of the group's fight against X.A.N.A. X.A.N.A. is using the school's antenna to take over the nearby television antenna. From there, he could take over a laser-equipped, military satellite.
#14 - Big Bug
Season 1 - Episode 5 - Aired 10/1/2003
X.A.N.A. manages to disable much of the city's infrastructure. Two trains that are completely automatic are put on a collision course, one of which contains a load of highly and deadly toxic chemicals. Yumi and Ulrich go to help Aelita, but Odd is forced to stay because Sissi tells on him to Jim for having Kiwi since he pulled a prank on her.
#15 - Log Book
Season 1 - Episode 4 - Aired 9/24/2003
Sissi finds and steals Ulrich's diary, so he is blackmailed into being her boyfriend. During a trip to a swimming pool, Jeremie and Yumi have the opportunity to find it. The new electric bus that is being used for the field trip is possessed by X.A.N.A. and starts acting weird as a result.
#16 - Replika
Season 4 - Episode 8 - Aired 8/21/2007
The group travels to one of XANA's Lyoko replicas. Aelita and Odd get into a fight after Odd's desire to sleep in gets them both in trouble. Nicolas and Herve follow them into the factory, where Jeremie is forced to distract them. William arrives to destroy the Skid, which would cut the group off from the supercomputer.
#17 - 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.
#18 - 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.
#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 - 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!
#21 - 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.
#22 - 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.
#23 - 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.
#24 - 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.
#25 - The Secret
Season 3 - Episode 7 - Aired 10/21/2006
William discovers Jeremy working in the factory and Jeremy attempts to go back in time to erase his memory. But when XANA attacks, it becomes impossible to go back and William must now help defeat XANA in the virtual world.