Code Lyoko is about a group of four boarding school students enrolled at Kadic Junior High School: Jeremie Belpois, Odd Della Robbia, Ulrich Stern, and Yumi Ishiyama. The students travel to the virtual world of Lyoko — which is found in a supercomputer housed in the basement of an abandoned factory near the school — to fight against a deadly multi-agent system named XANA and prevent him from taking over the world. In the first season, they also tried to bring a virtual being trapped on Lyoko, Aelita Schaeffer to Earth.
Amazing cartoon though it took a while to finish because of time available.
Animation wise this has a mix of cartoon like CG and just tradition cartoon animation to represent the two different worlds they are in and also to emphasize the fact that one world is practically the equivalent of entering a massive computer (who hasn't wanted to do that? XD).
Dialogue French or English whichever is good they are exactly the same voice actors (I think) just different languages. As a native English speaker who only knows how to count 1-10 in French I preferred the English version but I liked the opening song "World without Danger" was pretty good in both languages.
Story was not a full 5/5 due to the repetitive feeling of Xana is out doing evil things that affect the real world and they go to Lyoko to fix the problem. So that brought it down a bit in my opinion but however each event is unique and fresh so that was a good thing about it. The length of the anime is a good length allowing the audience to get to know the characters, have the characters develop and also introduction new gadgets and so on. They characters are also a good combination that don't clash or become annoying over a long period of time.
It is a cartoon I'd recommend to anyone with a lot of time to watch all 95 episodes or is planning to watch it over a long period of time. Its for those into action, technology and school life. A good kids cartoon that the male boys would be more interested (obviously) but girls might like it too.