Ulrich and William battle to impress Yumi during Drivers Ed at school, but they must find a way to put aside their differences and work together when XANA unleashes an army of Krabes in the real world.Watch Now:Amazon
When Jeremie yells at Aelita, he tries to go to Lyoko to apologize. Unfortunately, while Yumi is transferring him, she makes a scanner error, which leaves him trapped in a virtual limbo between Lyoko and the real world, so Aelita has to retrieve data to recover Jeremie without support in order to bring Jeremie back, but when she gets to the Mountain Sector, there are a couple of Blocks guarding the tower.
Aelita gets mad at Jeremie and she and Odd go into Lyoko without telling anybody. On Lyoko, Xana creates a diversion to get everybody to deactivate the tower in The Mountain Sector while the monsters worked on destroying the core of Lyoko. Jeremie and Aelita find a strand of DNA that belongs to Franz Hopper, indicating he may be still alive.Watch Now:Amazon
When Xana sabotages the supercomputer, weird bugs begin cropping up in Lyoko. Since the attack keeps draining power from the supercomputer, Aelita purposefully wipes out The Ice Sector leaving The Mountain Sector left.Watch Now:Amazon
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.Watch Now:Amazon
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.Watch Now:Amazon
Jeremy uses lessons from Franz Hopper's journal to create Marabounta, a program designed to combat XANA's monsters. But when his own creation turns against him, Jeremy must combine forces with XANA to defeat the monster.Watch Now:AmazoniTunes
When Xana possesses Kiwi, it turns the little dog into the carrier for a virulent virus that turns those it infects into zombies. Aelita and Jeremie are stuck in the cafeteria and Odd is a zombie himself. Jeremie and Aelita escape but Ulrich and the other students fight the rest.Watch Now:Amazon
Jeremie materializes a single hair of Aelita's. Meanwhile, different parts of the school begin to crumble apart. Jeremie learns that his first test damaged Aelita's program, and she'll be deleted if she tries to deactivate a tower. On top of that, they learn that X.A.N.A. is responsible for the damage being caused to the school by using ultrasonic sound waves, which continues to get worse.
Odd and Yumi travel to polar Siberia on a mission, only to be confronted by William who has been sent by XANA to stop them. Meanwhile, Ulrich and Aelita confront XANA's latest creature, the massive Kolossus.Watch Now:Amazon
After many X.A.N.A. attacks in a row, Ulrich starts to get tired of fighting. He also questions his relationship with Yumi and if she feels the same way about him. X.A.N.A. activates a tower without disturbing Earth, Jeremie forces Ulrich, Odd, and Yumi all to go to Lyoko to deactivate the tower. After being virtualized, a virus infection occurs on Lyoko because X.A.N.A. sabotages the Devirtualization Program, meaning if the group is devirtualized, they will permanently perish.
After an epic battle, William reappears at school, but his unusual behavior has attracted the attention of Sissi, editor of the school paper. William, who is clearly still under XANA's control, kidnaps Aelita, taking her back to Lyoko.Watch Now:AmazoniTunes
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.Watch Now:AmazoniTunes
Jeremy discovers the missing key to the link between Aelita and XANA. If they can get the missing piece from XANA, they can destroy him for good. But the evil super computer is ready for the ultimate battle to save itself from destruction.Watch Now:Amazon
Aelita continues to have strange visions related to a past she does not recognize. It is in fact one of XANA's schemes to draw her to Sector 5 where the Scyphozoa is waiting for her, but no one knows where the visions are coming from.
An unexplained incident on Lyoko ends up devirtualizing Yumi without any cause, she is taken to the infirmary. After waking up, she attacks Yolanda and continues to act weird wanting to go to Lyoko. Jeremie won't let them, cause he wants to know what caused her devirtualization. On Lyoko, Aelita finds several Roachters guarding an orange sphere-Guardian, and informs Jeremie.Watch Now:iTunes
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.Watch Now:AmazoniTunes
After another successful mission on Lyoko, our heroes rematerialize, but the program has malfunctioned and switched Yumi and Odd's bodies. It seems funny at first, until they realize if not reversed, they could both disintegrate for good.Watch Now:Amazon
After successfully reprogramming the Skid, Jeremy and the four other Lyoko Warriors discover another Replika in the Digital Sea called the Cortex. They intend to learn more about this mysterious, ever-changing sector. Meanwhile, William finds himself accepted temporarily into the group and aids them in the Cortex. Aelita also finds something very mysterious about her late father in the Cortex's interface.
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.Watch Now:Amazon
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 his mistakes on a complex exercise in class. Aelita suddenly is resentful and suspicious of this new girl, who seems to want to discover their secret. 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. Once on the Cortex, they are impressed by the new cruiser, which Yumi ends up driving. Unfortunately, Laura follows William to the factory and discovers the lab and Supercomputer, which she is very interested in. During a battle with several Krabes, Aelita, Odd and Ulrich are devirtualized, leaving Yumi trapped in the Megapod. With Laura's help, Jeremy fixes the bugged vehicle and Yumi is returned to Earth just before the Megapod falls into the Digital Sea. Back in the lab, the team debate about whether they should accept Laura into their group. Aelita, however, is still resentful and distrustful of Laura, and launches a return to the past so that she will not remember anything.