Code Lyoko Wiki
Code Lyoko Wiki

This page is for the virtual worlds. For the episode, go to Replika (episode).

The Replikas are digital worlds created by X.A.N.A. after it succeeded in stealing the Keys to Lyoko from Aelita, allowing the virus to escape the Supercomputer and infect other supercomputers around the world. These supercomputers each host a copy of Lyoko, but the only difference being that they each only have one sector comprising that digital world, instead of the original Lyoko which is comprised of five sectors.

Their existence was first discovered in Maiden Voyage, and more detail came into place about them in the episode Replika. The only way to destroy them is by destroying their supercomputer which is located somewhere on Earth, usually in a location relevant to the Replika's environment. There were ones in Siberia, New Mexico, the Amazon jungle, and even in outer space.


Lyoko is powered and sustained by a supercomputer. To host copies of Lyoko, different supercomputers would be needed. X.A.N.A. takes control of abandoned supercomputers to host Replikas and the surrounding area to produce various things for its eventual plan for world domination.

The supercomputers that contain the Replikas are located in environments similar to that of the sector that the Replika copies. For example, Forest Sector Replika supercomputer is located in the Amazon Rainforest. The Desert Sector Replika supercomputer is located in New Mexico. The Sector Five Replika supercomputer is located in space aboard the International Space Station. The Ice Sector Replika supercomputer is located in Siberia. The only known Replika for the Mountain Sector appears in the video game Quest for Infinity, but not in the animated series. However, a background design was initially created for it, featuring a large dam up in the mountains located somewhere in Canada.

It's debatable if the Volcano Replika and Cortex are Replikas or not, given that they don't duplicate a Lyoko sector, instead using their own design. They are still, however, referred to as Replikas. It's possible that the original sectors these presumably replicate were once parts of Lyoko, and were deleted before the Factory was discovered by the Lyoko Warriors. However, it's more than likely that the custom design of the Volcano Sector was made by X.A.N.A. itself, whilst the Cortex was designed from blueprints Professor Tyron had stolen from Franz Hopper.

It was discovered in Cold Sweat that X.A.N.A. had infected and controls hundreds of supercomputers all over the world, meaning that destroying each one by one was not an option as that would take way too long, which is why the Anti-X.A.N.A. Program was written by Jeremie and Franz Hopper. When that program was launched in its final form, it is almost certain that it destroyed every Replika in the Digital Sea, with the exception of the Cortex. It didn't destroy the Cortex because it wasn't registered as a X.A.N.A. creation and therefore the program didn't see it as a threat.

Logically, there would only be five actual virtual worlds that can be considered Replikas, which they would be the ones based off of Lyoko's sectors: the Forest, Desert, Sector Five, Ice, and Mountain Replikas. The other virtual worlds aren't technically Replikas of Lyoko's sectors, but are still referred to as Replikas to classify them.

Replikas are compatible with most of the software built for the Supercomputer. This includes the devirtualization and materialization programs, vehicles, and programs related to towers. However, any program that requires interfacing with the Factory's Supercomputer requires a link of some form, usually the Skid.

Replikas have floodgates and gravitational pulls surrounding their Virtual World Shells on par with Lyoko. These gates are usually locked and are usually hacked by Jeremie and Aelita.


It is unknown when the first of any of the Replikas were created by X.A.N.A. since their existence was never known until the maiden voyage of the Skidbladnir, but it is quite possible that they have been around since some time between The Key and Straight to Heart after X.A.N.A. stole Aelita's memory and the Keys of Lyoko and escaped the supercomputer, as the very first one was located by the Superscan in Straight to Heart, but it was not discovered until A Lack of Goodwill.

The first Replika was spotted in Maiden Voyage. It was a Forest Replika, which was confirmed in the episode Replika when it was explored as well.

With the exception of the Cortex, all of the remaining Replikas were destroyed in Fight to the Finish, by the Anti-X.A.N.A. Program.

List of Replikas[]

Sector of the Replika Supercomputer on Earth Destroyed by Episodes in which it appears
Forest Amazon rainforest (South America) Odd
Desert New Mexico (North America) Ulrich
Sector Five International Space Station (ISS) Odd & Yumi
Ice Siberia (Asia) Multi-Agent Program
Mountains Hydraulic Central of Canada (North America) Odd & Ulrich
Volcano Heart of a volcano Aelita & Odd



  • Along with the cut Mountain Replika, more Replikas were planned to be in the show as well. Exactly how many is unclear, as director Jérôme Mouscadet simply said "a lot more".[1] Sophie Decroisette confirmed at least one more was cut.[2] She also clarified that it wasn't the Volcano Replika, revealing it was never planned for the show and only created for Quest for Infinity.


  1. "Interview - Sophie Decroisette, partie 2". Ces Dessins Animés-Là qui méritent qu'on s'en souvienne. March 11, 2014.
  2. "Interview with Sophie Decroisette" - (2016)