Enjoying their normal lives, Jeremy Belpois, Ulrich Stern, Odd Della Robbia, Yumi Ishiyama and Aelita Schaeffer soon discover that there is trouble...

After successfully reprogramming the Skid, Jeremy and the four other Lyoko Warriors discover another Replika in the Digital Sea called the Cortex....

When a kid goes up to hug Aelita, he leaves and comes back and does the same to Yumi. Jeremy immediately realizes that XANA has sent a specter to...

A new girl-genius and highly gifted teenage girl named Laura Gauthier tries to join the quintet at Kadic Academy. She humiliates Jeremy by correcting...

William is yet again rejected by the group, but when he asks Yumi for her help on a project she happily agrees, much to Ulrich's disdain. The dislike...

Aelita is determined to discover if her father really is involved in XANA's miraculous and mysterious return. So she, Odd, Ulrich and William go to...

Samantha Suarez - Odd's former sweetheart and girlfriend - enrolls at Kadic, and the boy eagerly pursues her. At the same time, he is being pursued...

Jeremy tries to create a virus to destroy the Cortex, however it doesn't work and the group discusses what to do. They decide to bring Laura to the...

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...

The gang return to the Cortex to get data on the mysterious Ninjas. Ulrich opts out of the mission because he has a karate competition to attend, and...

Jeremy is woken up by the Superscan when it picks up two activated towers. He warns the others, and just as they're leaving Aelita receives a message...

A computer error causes the science test scores at Kadic to be messed up, as well as bugging up the rest of the computer system with it. Jeremy is...

The gang has planned a routine data gathering mission in the Cortex. However, Ulrich opts out of the mission when he finds out that Yumi wrote some...

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...

While the Lyoko Warriors prepare to take advantage of a sunny afternoon, XANA launches an attack, sending them a polymorphic specter disguised...