
XANA and Lyoko would be created on-screen by computer-generated special effects.
The world has changed since Odd, Yumi, William and Jeremie lost their lives in their last effort to finish XANA once and for all. Aelita was the only survivor, and she was put into a psychiatric hospital. When Vincent, Miyuki and Niko (all friends) who just happened to have moved to Kadic Academy Boarding School, have to clean up the town, their curiosity takes them to the same factory that the others lost their lives in. Upon looking thorugh the rubble, Vincent switches on the switch to the supercomputer. They notice a flash. Ever since then, their lives have been plauged by this evil entity named XANA. With the help of Aelita, they must find out what XANA has in store for them in this final round of Code Lyoko: Next Generation.
Miyuki

Adventurous, Wild, Observent, the smartest
Niko

The Fighter, Humurous, Energetic, Anxious
Vincent

Athletic, Intelligent, Casual
Aelita (17)

Much older. Put in an psychiatric hospital.
Mikah

Plans on solving the mystery herself. Just uses the others and minions.
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We drop in on Aelita, who is now 17, residing in a psychiatric hospital after losing her friends in the last battle against XANA.
Objective:
Come up with an elaborate way to kill off William, Odd, Yumi, Ulrich, and finally Jeremie, (in that order). Jeremie has to somehow fuse with XANA to destroy him. And the only way that XANA can be defeated for good, is if Aelita shuts down the supercomputer while Jeremie is still in it. Then she must tear down the supercomputer and leave this place forever.
*FLASHBACK*
. . .