with 2 episodes premiered on October 21, 2006

First episode where they discover the factory.

with 26 episodes 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.

with 26 episodes 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.

with 13 episodes 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.

with 30 episodes 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.