Burgessa- Yep i know VERY VERY short chapter. i just wanted to sum up what happens from season 2-4 cause i don't want to rewrite everything since most of it won't change. : / that and i'm lazy and wanted to get to the good part.
The gang had managed to bring Crystal and Aelita to earth but were unable to turn the supercomputer off due to Aelita being linked to Xana. So Life as the Lyoko warriors went on. Aelita had stumbled across an old house called the Hermitage and they soon learned that it belonged to an old Kadic science teacher named Franz Hopper. Crystal had informed the gang that Franz and her spent years on Lyoko's coding and that Xana was created to fight a government group called Carthage that was trying to hack into military satellites and control them. Aelita began having strange visions of Franz and of a life she never lived. After weeks of researching Franz and dealing with Xana now able to possess humans, they realized that Xana needed the keys to Lyoko from Aelita's memory in order to get into the network and that she was Franz Hopper's daughter.
A new school year started and Odd was already blackmailing Jim to get the gang back in the same classes, Jeremy, Aelita, Ulrich and Odd together in their grade and Yumi and Crystal together in the grade up. Xana was now free roaming the internet at will and that he is now residing in the United States. Aelita is now able to be devirtualized like everyone else and even gained Energy Fields as an attack. Xana then set his sights onto deleting Lyoko's sectors so the gang would have no way to get to sector 5 to save Lyoko's core, but to his disarray Crystal developed a way to virtualize directly there. With all 4 sectors destroyed the gangs asks William Dunbar to help them, proving his dreams of Lyoko were real. His first trip to Lyoko ended in him getting controlled by Xana and Xana-William destroyed Lyoko's core.
With Franz and Crystal's help, Jeremy recreated Lyoko sector by sector and created a ship called the Skidbladnir to travel to Xana's replicas of Lyoko which they realized gave him powers linked to the computer holding each replica. Jeremy developed a way to virtualize the gang into the real world to destroy the computers holding each replica and they succeeded. Xana developed a creature called the Kolossus which was almost as big as the Lyoko core chamber and Crystal realized that Xana was linked to multiple computers and that he was way too powerful. They end up creating a multi-agent program powered by Franz to go through the internet and destroy all of Xana's computer and the virus itself. Everyone but Jeremy were reluctant to turn off the supercomputer afterwards, after all it was the one thing that brought them all together as friends but after a day of talking and thinking they accept to turn it off forever.
One thing was certain- Crystal was still holding out on everything she knew and of her own past. As she was the last one left in the factory she walked around seeing everything she helped create.
"This isn't over, it is only the beginning. I'm sorry guys for holding out on you. You guys trusted me and I took advantage of it. It's time I tell you the whole truth about myself and about Carthage. Let me start from the beginning…." Crystal said to everyone in Jeremy's room.