Code Lyoko

XANA launches an attack by taking control of a student's teddy bear which grows to the size of a building. Odd and Aelita fight XANA from inside Lyoko while Yumi and Ulrich take on the giant teddy bear.

XANA threatens to take control of and destroy a nuclear plant and our heroes decide it's time to tell the authorities about Lyoko. But when no one believes them, Yumi, Aelita, Jeremy, Odd and Ulrich now must prevent a nuclear catastrophe.

Jeremy purposely gets in trouble so he can keep an eye on XANA while everyone else is gone for vacation. But when the super computer unleashes a poisonous gas, Jeremy realizes he cannot take on XANA himself and calls his friends for help.

During a field trip to the local swimming pool, XANA takes control of the electric school bus and tries to send it crashing into the city's chemical complex. Odd and Yumi travel to Lyoko to stop the bus in time, with some help from Aelita.

XANA unleashes a computer virus that wreaks havoc on the city's infrastructure. When two trains become headed on a collision course, our heroes must travel into Lyoko and stop the deadly collision from occurring.

Jeremy tries to bring Aelita out of Lyoko, but XANA prevents it by taking control of nearby bulldozers which may destroy the factory. During a battle, Yumi falls in the digital sea and Aelita can't be brought to life if Yumi is to be saved.

Yumi is held captive in Lyoko while her evil clone attempts to destroy the heroes. Meanwhile, an unsuspecting Jeremy sends Odd and Ulrich to Lyoko to help Aelita deactivate a tower, but he ends up alone, face-to-face with XANA.

A movie director begins filming in our heroes' factory, so Ulrich works on the film to make sure no one discovers their secret. But that will be no easy task when XANA takes control of an alien monster prop intent on destroying the heroes.

XANA takes control of a nearby communications antenna and plans to use it to turn a powerful military satellite into an instrument of mass destruction. Our heroes must now do battle in Lyoko before the satellite can launch its weapons.

The new girl in school looks exactly like Aelita, and it's too much of a coincidence for Jeremy, who has been desperately trying to bring her out of Lyoko. Things get even stranger when suddenly there's no sign of Aelita on Lyoko!

Jeremy's teachers are convinced he's a gifted student and suggest he switch to a more advanced school. Meanwhile, XANA unleashes an army of attack rats and Jeremy is stuck in exams; without him, our heroes can't enter Lyoko to stop XANA.

Sissi's jealousy stirs up trouble between Ulrich and Yumi. When XANA contaminates the wasps on the school grounds and send them to attack, Odd and Jeremy are worried the lack of team spirit may cause them to lose this battle.

Jeremy has trouble materializing Aelita, and actually makes matters worse. While he tries to de-bug her program, XANA launches his latest attack, putting Odd in grave danger. Our heroes must decide: Defeat XANA or sacrifice Aelita?

XANA takes control of the factory and traps Yumi, Ulrich and Sissi in the elevator, which plummets to the ground and begins filling with water. Yumi escapes and gets help from Odd and Aelita to deactivate a tower on Lyoko before they drown.

XANA unleashes an attack of laughing gas on the school, inducing fits of laughter which leave our heroes dangerously short of breath. While they try to thwart XANA's latest scheme, Yumi is concerned about her parents who are about to visit.

The students are trapped inside their cafeteria when XANA transforms the metal siding of the school's walls into an electrified prison cell. Only Yumi, who was not inside, can stop this attack and she gets some help from Aelita in Lyoko.

XANA creates viruses which attack human brains, causing amnesia. Sissi takes advantage of this and convinces Ulrich that Odd, Yumi and Jeremy are his enemies. Now they must battle their friend and find a way to reverse the viruses.

After Odd and Sissi go into a trance and then to the hospital when their pulse slows, Jeremy, Ulrich and Yumi discover that XANA has been sending out a song on the radio which is doing this to everyone who hears it.

Jeremy convinces Yumi to send him to Lyoko so he can speak in-person with Aelita, but when she hits the wrong key, he becomes stuck between worlds. While they struggle to bring Jeremy back, XANA unleashes a deadly attack on Aelita.

During a school robot competition, XANA secretly enters a robot of his own, creating panic and mayhem. Now Ulrich and Yumi are forced to enlist Herve's help to destroy it while Jeremy and Odd head to the factory to battle in Lyoko.

XANA creates an ever-increasing zero-gravity zone on the field during the Kadic soccer final, forcing Ulrich to decide whether to stay with his teammates on the soccer field, or help his friends battle the super computer in Lyoko.

Ulrich begins dating a new girl, which makes Yumi angry. Unfortunately, XANA sets a trap unlike anything our heroes have seen before, and unless Yumi and Ulrich can overcome their differences, no one will be able to get out of Lyoko alive.

Odd's budding romance with Samantha takes a terrible turn when she steals a laptop and Odd is blamed. Meanwhile, XANA has taken control of the school building's foundation which is now crumbling and getting to Lyoko is their only hope.

XANA traps Ulrich, Odd and Yumi in a virtual universe and they don't realize there's a fake Jeremy with them who is intent on destroying them. The real Jeremy must now save his friends single-handedly before it's too late!