Season 1
Episode 1: Teddygodzilla
- XANA takes over a teddy bear and uses it to attack the city.
Episode 2: Seeing is Believing
- Aelita and Lyoko are compromised when XANA attacks a nuclear plant. Will the gang have to reveal their existence?
Episode 3: Holiday in the Fog
- Jeremy stays at school over a long weekend, but Sissi stays to keep an eye on Jeremy! Will the gang be able to save
her when toxic gas floods the school?
Episode 4: Log Book
- Sissi finds Ulrich's diary!
Episode 5: Big Bug
- XANA creates a virus that could infect the entire city. To defeat him, the gang will have to band together, but
communication is a problem!
Episode 6: Cruel Dilemma
- Odd manages to create a working materialization program for Aelita by accident, and there's no way it will work more than
once. What will the gang do when forced to choose between Yumi and Aelita?
Episode 7: Image Problem
- What's wrong with Yumi after a trip to Lyoko? Is it XANA?
Episode 8: End of Take
- A movie is being filmed in town, but what will the gang do when XANA possesses one of the film's props: a dangerous alien!
Episode 9: Satellite
- XANA divides the team by removing their only form of communication: their mobile phones! Once they're incommunicado,
XANA turns a satellite into a death ray, and he's targeting the gang!
Episode 10: The Girl of the Dreams
- A girl named Tealia shows up at Kadic, and Jeremy is certain that she's Aelita! Also, a suit of armor that Yumi
brought to school for her report on Japan goes berserk!
Episode 11: Plagued
- XANA becomes a Rat King and attacks the school. Oh, rats!
Episode 12: Swarming Attack
- XANA uses hornets to attack the gang.
Episode 13: Just In Time
- Jeremie goofs while trying to work on his materialization program, meaning that the next time Aelita deactivates a tower,
she could be deleted!
Episode 14: The Trap
- It's a one-year anniversary for Aelita and the gang, but will they be able to celebrate when the machinery in the Factory
starts a war against them?
Episode 15: Laughing Fit
- What will the gang do when XANA launches an attack using laughing gas?
Episode 16: Claustrophobia
- Odd and Ulrich are trapped in the cafeteria when XANA attacks. Will Jeremie, Yumi, and Aelita be able to save them?
Episode 17: Amnesia
- Ulrich and everybody else starts to lose their memories when XANA attacks using nanoprobes. When it comes down to
the wire, Jeremie will have to send Ulrich to Lyoko...memory or no memory!
Episode 18: Killer Music
- A new song, "Glad When You're Bad," has everyone passing out. While Odd's in the hospital, will the rest of the
gang be able to stop XANA?
Episode 19: Frontier
- After an inadvertent argument with Aelita, Jeremie tries to go to Lyoko to apologize to her. There's just one problem--the
computer runs out of memory, and the gang can't get Jeremie back to Earth!
Episode 20: The Robots
- XANA launches an attack using robots he makes at the Factory. The only person who can help the kids stop the robots
is Herve!
Episode 21: Zero Gravity Zone
- XANA leaves the gang up in the air when he lessens the earth's gravity, and Ulrich tells the gang he's going to quit going
to Lyoko.
Episode 22: Routine
- Ulrich's tired of the same old routine and of waiting to find out if Yumi likes him or not. At the same time, XANA
infects himself with a virus in order to disrupt the scanner programs.
Episode 23: Rock Bottom
- XANA tries to bury the city while Odd gets in serious trouble.
Episode 24: Ghost Channel
- Odd, Ulrich, and Yumi are trapped in a virtual replica of the school, and Jeremie and Aelita have to get them out, but
XANA has something to say about that...
Episode 25: Code Earth
- It's time to materialize Aelita, but Jeremie is injured and trapped in the school's infirmary. How will he get to
the Factory?
Episode 26: False Start
- XANA still has some tricks up his sleeve despite the fact that the kids managed to materialize Aelita.
Season 2
Episode 27: New Order
- Aelita has strange visions of a house called The Hermitage, and Ulrich is jealous of a new boy who is interested in Yumi.
Episode 28: Uncharted Territory
- Feeling homesick, Aelita returns to Lyoko, but ends up in a place she's never seen before.
Episode 29: Exploration
- The gang decides to explore Carthage, but Yumi's parents make her stay home.
Episode 30: A Great Day
- XANA manages to gain control of the time control mechanism, and the gang is trapped living the same day over and over
again.
Episode 31: Mister Puck
- Aelita's increased nightmares lead the gang to explore the Hermitage once more in a search for answers.
Episode 32: Saint Valentine's Day
- A mystery Valentine's present makes Jeremy jealous while Aelita thinks it came from him. What is it, and what will
it mean for the gang?
Episode 33: Final Mix
- Aelita's DJing a school dance while XANA makes his move...
Episode 34: Missing Link
- Yumi's trapped in Lyoko when XANA takes a needed component for materialization from her.
Episode 35: The Chips Are Down
- Yumi may have to move, so Ulrich does the unthinkable in order to get her to stay by launching a return to the past.
Episode 36: Marabounta
- Jeremie launches a program that is designed to fight XANA's monsters, but what will the gang do when it targets Aelita?
How about getting help from XANA?
Episode 37: Common Interest
- The supercomputer is losing all its power, and that means bye-bye XANA ...and Aelita!
Episode 38: Attack of the Zombies
- XANA turns everyone into zombies. How will the gang fight their friends?
Episode 39: Ultimatum
- XANA takes Odd and Yumi hostage, and tells the gang that they either deliver Aelita to Lyoko to have her memory
taken, or he'll kill his hostages.
Episode 40: A Fine Mess
- A problem with the materialization process results in Odd and Yumi switching bodies!
Episode 41: XANA's Kiss
- XANA messes with everyone's friendships.
Episode 42: Vertigo
- A possessed pack of wolves gives the gang trouble.
Episode 43: Cold War
- XANA messes with the weather to give the gang some trouble. What will they do?
Episode 44: A Bad Turn
- XANA materialized Krabes into the real world while Ulrich is jealous of William.
Episode 45: Deja Vu
- Aelita's nightmares are getting worse and worse.
Episode 46: Tip Top Shape
- While having a school check-up, Aelita is kidapped by a XANA-possessed school nurse!
Episode 47: Franz Hopper
- Franz Hopper arrives to help the kids in their fight against XANA!
Episode 48: Is Anybody Out There?
- XANA's able to attack the real world, and the gang isn't able to find the activated tower in order to stop the attack!
Episode 49: Temptation
- The gang's worried as Jeremie seems to be working himself into a state of exhaustion. What's he up to?
Episode 50: Contact
- What's trying to communicate with the gang through Sissi?
Episode 51: Revelation
- The gang learns more about Franz Hopper when they manage to decode his diary.
Episode 52: The Key
- Aelita is depressed by revelations about Franz Hopper and Code Lyoko, and decides to take a desperate action to get rid
of XANA. At the same time, the end of the school year dance is approaching.
Season 3:
XANA Awakens (1)
- Jeremie turns on the supercomputer and meets an artificial intelligence he calls Maya.
XANA Awakens (2)
- Jeremie, his classmates, and Maya are threatened by the supercomputer virus, XANA!
Straight to Heart
- The gang returns from summer vacation and Odd is devastated to learn he's not in any class with his friends. Also,
they have to find where XANA's hiding in the real world.
Lyoko Minus One
- Yumi's on a class field trip when she's attacked by XANA, and Jeremie and Odd and Herb all run for class president.
Tidal Wave
- XANA sends a food monster after the gang.
False Lead
- XANA tries to get the kids in trouble when he uses Jeremie's computer to access classified information.
Aelita
- Aelita has memories of her past and goes to Lyoko to search for her father, and Odd realizes that his feet really stink!
The Secret
- William's determined to find out what the gang's hiding, and a XANA-possessed demolitionist is setting charges in the
Factory!
Temporary Insanity
- Odd and Ulrich are trying to fight monsters even though they're back on earth.
Sabotage
- Jeremie and Aelita try to repair the supercomputer, but vines and dorm inspections make that a little hard to do.
Nobody in Particular
- Ulrich's mind and body become separated.
Triple Trouble
- Odd's new Lyoko power makes him part of triplets!
Double Trouble
- A clone of Jeremie causes trouble for the gang.
Final Round
- William at last goes to Lyoko, but is this a good thing?
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