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Plot
Jeremie Belpois, a profoundly gifted and intelligent thirteen-year old boy attending boarding school at the fictional Kadic Academy, one day discovers a quantum supercomputer in an abandoned factory near his school. Upon activating it, he discovers a virtual world called Lyoko and Aelita, a young girl trapped inside it.
Afterward, unusual events begin to occur at school. Jeremie learns of X.A.N.A., an autonomous and sentient malevolent and rouge artificial intelligence/multi-agent system who also dwells within the supercomputer whose goal is to take over the real world. Jeremie soon forms a goal to materialize Aelita into the real world and stop X.A.N.A. in his tracks. With the help from Jeremy's best friends and classmates- Ulrich Stern, Odd Della Robbia, Yumi Ishiyama, and Aelita-the group goes to Lyoko in hope to save both worlds from the sinisterly evil virtual entity. -
Location
Contrary to popular belief, the show takes place in France. While characters in the English dub sometimes hint that they may live in America, shots of satellite maps and other visual clues give the setting's true location away.
To be more precise, the show takes place in two different worlds - ours, and Lyoko. While the "real" world has 2D animation, Lyoko has full on computer 3D graphics.
The real world's main location is the Kadic Academy, a boarding school that Jeremie, Ulrich, Odd, Yumi, Aelita, and William attend, though the latter two don't attend it until later seasons.
On the other hand, Lyoko is divided into five different "sectors" - Forest, Desert, Polar, Mountain, and the secret fifth sector, Carthage.