Season 0 of Code Lyoko premiered on October 21, 2006.

First episode where they discover the factory.

Season 1 of Code Lyoko premiered on September 3, 2003.

After discovering a parallel universe hidden inside a supercomputer, four students must stop a renegade virus from destroying the secret world.

Season 2 of Code Lyoko premiered on August 31, 2005.

The Lyoko Warriors have their work cut out for them as XANA gains power, with an ability to possess humans and create even more mayhem on Earth.

Season 3 of Code Lyoko premiered on September 9, 2006.

As Season 3 opens, XANA has escaped from the supercomputer and is bent on destroying Lyoko so that the Warriors will be unable to stop his evil plots.

Season 4 of Code Lyoko premiered on August 13, 2007.

Jeremy and Aelita must rebuild a new Lyoko to replace the one XANA maliciously destroyed at the end of the third season.