Lyoko. A vast unexplored virtual world. That is until a student Jeremy Belpois came across it and activated the super computer and awakening Xana. With the help of a use to be Lyoko guardian named Aelita and other Kadic academy students the fight to protect the world from Xana has revealed more than what the Lyoko warriors were thinking of finding. From finding out that materializing virtual people is possible, to discovering the very man who created Lyoko and Xana, and a virus that can cause issues in the real world the Lyoko warriors have fought so many challenges and uncovered many mysterious all except one. Aelita thought she knew everything about her past when in fact a very important fragment that her father didn't give back to her is still missing. She doesn't know until one dream begins to reveal yet another mystery hidden inside the deepest depths of Lyoko.