Air date: 2003-09-03

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

Air date: 2005-08-31

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.

Air date: 2006-09-09

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.

Air date: 2007-08-13

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