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"Welcome to Sector Five, everyone."

Jeremie in Uncharted Territory

Sector Five (also known as Sector 5) is the center of Lyoko and is connected to the four surface sectors by data tunnels that links to each sector's Way Tower. At the center of Sector Five itself lays the Heart of Lyoko, the source of all data in the virtual world which holds the core programs, including X.A.N.A. when it was tied to the Supercomputer.

The walls of Sector Five are a bright blue and covered in a moving binary code. Whenever the Lyoko Warriors come to Sector Five, the blue blocks the sector is made to arrange themselves into a random, maze-like layout. Upon entering Sector Five, they can enter into core zone and take the elevator up to an interface panel in the Celestial Dome on Sector Five's surface, or up to the hangar containing the Skidbladnir, their virtual ship. The interface panel has a direct link to all of the Supercomputer's data, thus allowing Aelita to help Jeremie recover information from it.

The sector's main unique feature is its many traps, all of which do heavy life point damage, often enough to devirtualize any of the Lyoko Warriors in just one hit. These traps can be deactivated by activating a key present on the wall of the room. The Digital Sea is not present here; instead, falling into the Celestial Dome ensures ultimate deletion.

Sector Five, like the other sectors, has towers (though only two, or possibly three, have been seen to date) and is inhabited by monsters. Many of the more powerful monsters, such as Creepers, Mantas and the Scyphozoa, were originally unique to Sector Five before X.A.N.A. became strong enough to send the latter two to the other sectors.

In "William Returns," Jeremie and Aelita use data transferred to them by Franz Hopper to recreate Sector Five. In this recreation, they got rid of the countdown procedure to make trips easier and the elevator is capable of stopping to allow our heroes to board it. William opens a tunnel and takes Aelita to the place where the Desert Sector stood before (now recreated in "Double Take"), the outer shell of the Celestial Dome now has a graphite craggy appearance with cracked holes that showed the exits of the tunnels. Before Sector Five was destroyed by William, the outer shell shined with a bright light.

Sector Five was the last sector destroyed in Season 3, the first one recreated and shown in Season 4, second to last one shown in Season 2, and the first sector shown in Season 5.

In Code Lyoko Evolution, two new towers are discovered in the Core Zone. The first one is located in the Core Zone. The second one is in one of the lowest rooms, which looks similar to the room where Aelita's fake missing fragment was kept by X.A.N.A. The Core's shields have been turned into sphere shapes. X.A.N.A hasn't attacked the Core, probably because he needs Lyoko's Towers to attack Earth. Jeremie also recreated the Skidbladnir to its hangar.

Parts of Sector Five

The Arena

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This is the spot where the Transport Orb used to drop off Aelita and the other Lyoko Warriors. Now the group can simply be virtualized directly into Sector Five where they land in The Arena. The group must stand still for a few seconds so that the wall will open.

The Core Zone

The Skid in the Carthage Replika

The most recognizable area of Sector Five. Before Sector Five was rebuilt, a three-minute countdown started for the group to find the Key. Pushing the Key would cause a corridor leading to the elevator to open. If the Key was not found in time, the group would be trapped in Sector Five until someone else entered it and pressed the key. The Core Zone is different every time somebody enters. However, when Jeremie and Aelita recreated Lyoko, they removed the countdown so the warriors could go straight to the Elevator. The Core Zone also contains the towers. The first one seen in the Sector Five in episode Franz Hopper was different from the others. Instead of being placed on the ground like in the other sectors, it floats in the mid-air exposing its "roots." Despite it's advantages and difficulties when it comes to reaching it, X.A.N.A. activated it only once. This tower was also mentioned in William Returns and the copy of it was seen in Sector Five Replika in A Space Oddity. Another tower was discovered in X.A.N.A. 2.0 and the third one was seen in the lower levels of Sector Five in Friday the 13th.

The Lower Levels

Code Lyoko - The Sector Five - The Lower Levels

This area is set beneath the main core zone and it was discovered in The Key and later re-visited in Friday the 13th. Unlike the main floor of the Core Zone, the lower levels are in much darker shade of blue and the whole layout looks damaged as the blocks are slant and look like they are about to collapse. X.A.N.A. hid the Aelita's fake missing fragment in lower levels of the Core Zone and later caused the blocks in the whole room to collapse and successfully trapped Aelita in it. In Evolution, the group found a new tower in this portion of Sector Five.

The Elevator

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The elevator runs all the way around the Core Zone. It can move up, down, and sideways. It only stops at the Celestial Dome exit. As shown in "Skidbladnir"" Jeremie and Aelita created a separate elevator to access the Skidbladnir Hangar in one portion of the Core Zone. In "Virus," Aelita used the elevator to access the Chamber of the Core of Lyoko instead of using the south pole entrance.

The Celestial Dome


The exit point of Sector Five. It has an interface that gives access to X.A.N.A.'s own data in Season 2 and Lyoko's data. When a Lyoko Warrior enters, Mantas usually come out from the outer sphere.

The Outer Sphere

Celestial Dome seen in Season 3

The Celestial Dome has a massive air-gap surrounding it, which is in chain surrounded by the Outer Sphere. This is a giant wall of panels of Binary Code. These walls darkened in "The Key," when Aelita temporarily died. The outer sphere is of unknown density or thickness. This area can perform Manta Hatching.

The Outer Shell

Carthage outer shell

Sector Five has a shell of some sort. Prior to the first destruction of Lyoko, this was a massive illuminated center of Lyoko. When Lyoko was restored, tunneled gaps were added. In Code Lyoko Evolution, this in chain became a massive paneled shell, like that of the armadillo.

Core of Lyoko

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This is the most important part of all of Lyoko located beneath the Arena. The core contains all of the data within the supercomputer. The room where the core is located can be accessed through the south pole of Sector Five. In "Final Round," a possessed William managed to destroy the core, thus causing the virtual world to disintegrate, leaving nothing but the Digital Sea. The core was successfully recreated in Season 4's premiere episode and made its first reappearance in "I'd Rather Not Talk About It" when William launched an attack on it. An alternate route exists via a dead-end wall as seen in Nobody in Particular.

The South Pole

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This is the southernmost point of Sector Five. It provides access to the core chamber. It has a constantly opening and closing hole, which can crush something with bad timing as seen in "Straight to Heart" when it crushed the Manta. It's only accessible by vehicles and flying monsters.

The North Pole

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This is a perpetually open hole in recreated Sector Five's shell, which allows access to the Skidbladnir Hangar from the outside and allows the Skidbladnir to leave Sector Five. Mantas are capable of flying through here, and in "The Lake," the Scyphozoa accessed the hangar from this hole as well.

The Interface

Interface - Virus

It gives access to all of Lyoko's data, which is also X.A.N.A.'s entire memory. It was commonly used by Aelita to look out for the important information for the heroes such as the information about Aelita's so called virus, the DNA codes ("Missing Link"), the information about Franz Hopper ("Temporary Insanity"), the information about debugging the Digital Sea ("Tidal Wave") and in "Fight to the Finish," Aelita used it to launch Anti-X.A.N.A. Program. But whenever Aelita is using it, Jeremie cannot do anything.

The Tunnels

Kartagina 3

There are 4 tunnels leading to the other 4 surface sectors. These are used to get the warriors out of Sector Five without devirtualizing them. Before Lyoko was destroyed, the tunnels used to lead to the surface sectors' Way Towers but when Lyoko was destroyed and then recreated, the Skid leaves Sector Five and enters the empty Desert Sector.

The Key

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It is used by hitting it. It prevents the 3-minute countdown reaching zero. If it does end up reaching 0, the Lyoko Warriors must run back to the Arena. Yumi was the first to activate the Key in "Exploration." When Sector Five was recreated, this, along with the countdown, was removed with the exception of the key in the chamber of the Core of Lyoko that still exists and creates stairs to the core chamber.

Skidbladnir Hangar


Practically the newest room in Sector Five, the Skid Hangar was created by Jeremie and Aelita when they recreated Lyoko. It serves as a hub for their virtual ship, the Skidbladnir and is accessed from a different elevator in the Core Zone. After the Kolossus destroyed the Skid in "Down to Earth," the hangar remained empty until Jeremie and Aelita recreated it in "Cortex." The room is big, circular and in the much darker shade of blue. It has a ring-shaped platform, connected to the elevator and the Skid's supports. The platform has a part with 5 circles, which are used to enter the Skid and Nav Skids.

Monsters Seen

In Order of Appearance


  • Throughout Season 4, X.A.N.A. seemed to correspond his Replika's settings to the real-world locations of their corresponding supercomputers (i.e. the Forest Replika's supercomputer was stationed in a real forest). This implies Sector Five was originally designed to be space-themed, since the Sector Five Replika's supercomputer was set on a space station.
  • There has been some confusion over whether the sector was actually called Carthage, named after the Project Carthage, which was itself named after the ancient city of Carthage which challenged the Roman Empire. However, an interview with head writer Sophie Decroisette states that the sector's official name is "Sector Five."[1]
  • It was allegedly never decided what the white void was in certain rooms of Sector Five. When one of the directors of Code Lyoko Evolution asked about it, they said "nobody was able to give me a precise and certain response."[2]
  • Sector Five was the last sector of Lyoko explored by the Lyoko Warriors.
  • Sector Five was the only sector of Lyoko not seen in Season 1.


>> More images of the Sector Five in Season 2

>> More images of the Sector Five in Season 3

>> More images of the Sector Five in Season 4

>> More images of the Sector Five in Evolution

Code Lyoko: Get Ready to Virtualize

Concept Art