This is a list of episodes for the first season of the French teen drama science fiction television series, Code Lyoko: Evolution created by Thomas Romain and Tania Palumbo and produced by the MoonScoop Group for France Télévisions, Lagardere Thematiques and M6, in association with Sofica Cofanim and Backup Media.
Enjoying their normal, thirteen-year-old Jeremy Belpois, fourteen-year-old Ulrich Stern and Odd Della Robia, sixteen-year-old Yumi Ishiyama and 22/23-year-old Aelita Schaeffer soon discover that there is trouble still brewing at Kadic Academy.
A new, highly intelligent and gifted teenage girl named Laura Gauthier tries to join the quintet at Kadic Academy.
Meanwhile, Jeremy informs his four friends that he has programmed a new vehicle that is made for travelling through the Cortex easily called the Megapod, and Yumi is chosen as the driver.
With Laura's help, Jeremy fixes the bugged vehicle and Yumi is returned to Earth just before the Megapod falls into the Digital Sea.
William Dunbar is yet again rejected by the quintet, but when he asks Yumi to come work on their group project she happily agrees, much to Ulrich's disdain.
Jeremy and Aelita program false source codes that will destroy any specter that tries to take them from a Lyoko Warrior, and tests it using Ulrich as a guinea pig.
Ulrich is told to wait at school until he spots a specter and deliberately touch it to transfer the fake source codes to it to test if they work.
With the advice given by Ulrich, and a new bo staff weapon programmed for Yumi, she manages to defeat the three Ninjas easily and gathers the data.
In it they find a video clip of Professor Tyron addressing several humans dressed in ninja-like costumes.
He warns the others, and just as they're leaving Aelita receives a message from an unknown sender asking her to meet them in a nearby building.
They return home and Odd comes to the lab feeling gloomy about not actually winning the lottery and his situation with Samantha, having bought a thousand red roses to give to her thinking he truly had won the jackpot.
Another tower is activated and Ulrich and Aelita are shut in a closet under Odd's protection while Yumi calls a truce with William so they can go to Lyoko.
Not getting a decent answer, she goes to do research in the library before confronting Aelita, saying that she knows Franz built the Supercomputer, and that he apparently abandoned his daughter.
A man named Graven shows up at Kadic asking after Jeremy, the smartest kid in school, offering him a place in a special scientific institution specialising in quantum physics.
Jeremy denies having any knowledge of the subject, then figures out that Graven is an agent sent by Tyron, and that they must have traced Lyoko's location on Earth somehow.
Aelita sends the others to Sector 5 to search for any kind of tracking device that the Ninja from episode 14, Stowaway, could have planted while it was on Lyoko.
Jeremy and Laura finish the virus and the group plans to implement it that afternoon, but Odd gets detention and Ulrich sprains his ankle, forcing both of them to opt out.
After the mission Jeremy tells her the good news: they were able to steal 4% of XANA's power and Odd is capable of deactivating towers again.
Jeremy manages to develop a program that will allow the gang to hack Tyron's surveillance system and spy on him, both using video and sound, and potentially speak to Anthea.
Aelita opts to stay in the Cortex's core to wait for her mother to appear, asking for a clone to replace her at the school while she's gone, which causes enough problems of its own.
Yumi suggests they have a girls' day out to take her mind off things and Aelita accepts, but Sissi decides to invite herself along as well.
Laura is keen to implement it immediately and destroy both the Cortex and XANA, but Jeremy insists they wait until Aelita has made more progress with her mother, Anthea.
It has been activated by Tyron, and the Lyoko Warriors are soon surrounded by Ninjas, and Odd, Aelita and Ulrich become trapped in a temporal bubble that sends them back to that morning's gym class, repeating it dozens of times over.
They must find a way to contact Jeremy to tell them what happened so that he can destroy the bubble before Tyron uses its signal to track their location on Earth.
A mission to gather more information on Aelita's mother is cancelled when XANA launches another attack in the Mountain Sector.
But due to interference from XANA, they don't even make it inside the Dome; the mission is a failure and they're forced to wait twelve hours before they can try again.
As she's on her way back to the lab for their second attempt of finally exterminating their longtime virtual enemy once and for all, Aelita is called to the principal's office where she finds Tyron waiting for her.
After finding out the locket contains a tracking device, Yumi takes it and stays at the school while Aelita goes to join Odd, William and Ulrich on the Cortex.