Kalamar

The Kalamar is one of the new monsters in the fourth season of Code Lyoko. It has an oval black/grey body with four long legs sticking out of it. The Eye of XANA is located in the middle of The Kalamar's body. Its movements mimic that of a squid.

• The Kalamar is the second largest monster in existence, exceeded only by the Kolossus.
• Unlike other monsters, the Kalamar's primary weapons aren't lasers. Instead, its enormous legs hold the target still while it uses the drill on its underside to attack.
• Like the Scyphozoa this monster has only been destroyed once (mostly because it has only appeared once) however it appears to follow the Scyphozoa's fighting style, wait for the target to be isolated by other monsters and then attack.

Kolossus

The Kolossus (fr: Kolosse) is the largest and most powerful monster created by Xana, larger than the towers on Lyoko and strong enough to push them over barehanded. The Kolossus is created using the combined power of hundreds of supercomputers that Xana has control over. It resembles a golem made of hardened lava, with the molten kind flowing through its body like blood. Its head somewhat resembles an insect, with two loose mandibles hanging from its chin. Several dreadlock-like extensions also come out from the top. The Kolossus is said to be from the Volcanic sector despite how its created in the show, which is only available in the video games. The Kolossus has five eyes of Xana on its body: there is one on its head, one centered on its sword arm, and three smaller ones clustered around the latter. Hitting either eye has no effect on the creature, but hitting both large eyes destroys it. When it dies, the lava portions of its body harden, leaving a frozen corpse behind. This was proved on the episode "Fight to the Finish", when Ulrich stuck one of his swords into the Kolossus' head, and then fell off, hitting the Kolossus' Sword-Arm and when the others went in the Transport, the Kolossus fell on Ulrich, devirtualizing him. It is believed that the Kolossus' corpse disappears after a short period of time, like the other monsters.

The Kolossus has no visible laser weapon. Instead, it causes devirtualization by either stepping on its foes, landing on them, or swiping at its enemies with its giant sword-like hand. The Kolossus uses no strategy in battle; its only function is to devirtualize the warriors and to destroy the Skid. While powerful, its size prevents it from attacking rapidly, so other monsters are occasionally deployed alongside it to pick off any warriors it fails to devirtualize. Also, due to its immense size and space, its deployment is limited only to a battlefield large enough to accommodate it — namely the Ice Sector.

In order to destroy it, one would have to simultaneously hit the Eye of XANA on its head and its arm. Ulrich managed this feat in Fight to the Finish, thus destroying it. The Kolossus will appear in Code Lyoko DS 2.

Kongres

Kongres are eel like enemies in the digital sea. The eye of XANA is on a small yellow pod in it's blue jiggly body. This monster was seen in the episode Maiden Voyage. They don't appear to be able to go on on land or Sector 5. Kongres are very agile as they are able to follow the Skidblanir and its pods with great ease as well as easily dodging torpedoes fired from the pods. Their weapons are the same as all XANA's monsters; they shoot lasers from their eyes. Kongres seem capable of communicating like Tarantulas through a series of cries, this was shown when the team first found them in The World Network

Sharks

Sharks (also called Rekins) are one of the new monsters in Season 4 of Code Lyoko. It is black and white, and it looks like a shark with a long fin on its back. It looks similar to a Manta. It is one of the newest of the monsters and is related to the Kongre. Instead of firing a normal Laser like most monsters, Sharks fire what appear to be torpedoes from their mouth (similar to the ones the Nav Skids fire, Perhaps because the Scyphozoa absorbed data from the skid in The Lake)

Guardian

A Guardian is one of XANA's monsters. Referred to by the Princess as "a sort of digital jail adapted to the body imprisoned in it", Guardians have the ability to capture a being inside Lyoko at the time, and keep them imprisoned to prevent them from stopping XANA. XANA first used this method in Image Problem to trap Yumi and send itself to the real world in her place. Yumi was, of course, rescued. XANA used a Guardian the second time in The Girl of the Dreams to imprison Aelita, making Jeremie think that Taelia was Aelita materialized, but, once again, Team Lyoko stopped XANA's plot. The final time XANA used a Guardian was in Ghost Channel, when he created a simulation of Boulogne-Billiancourt to trap Yumi, Odd, and Ulrich. That Guardian was destroyed by Aelita. Guardians have not appeared since Season 1, probably due to the fact XANA realized their weakness and inconsistency with reality.

Guardians are nearly invincible. They, as seen in Ghost Channel, can be destroyed by Aelita's Creativity, but cannot be destroyed by the Lyoko Warrior's weapons, as they have no Eye of XANA. A much less painstaking process is to bring a clone of the prisoner in front of the Guardian, and then the Guardian, confused, will eject the prisoner out and explode in a brilliant orange flash.

Scyphozoa

Resembling a giant jellyfish (fr: la Méduse, which means the Jellyfish. Scyphozoa is in fact the scientific name for jellyfish, from the Greek words for "cup" and "animal") with long tentacles protruding from its sides, the Scyphozoa is much larger than the rest of Xana's monsters. Its eye is located on a green diamond just in front of its head. The head is bulb-shaped, and sits on its cone-shaped body. Unlike the other monsters, who move through some form of physical transportation (legs or wings), the Scyphozoa is able to float as if it were swimming through water. This enables it to easily reach otherwise unaccessible areas on Lyoko, and also makes it highly maneuverable in close quarters. Unlike Xana's regular monsters (except the Kolossus), the Scyphozoa is the only monster of its kind. The Scyphozoa also makes a unique, creepy (No idea what to compare it to) noise that signifys its appearance and/or approach.

In the second season, the Scyphozoa appears fairly frequently and has only one specialized function: stealing the memory of its target. The Scyphozoa's main target is Aelita, though it targeted Yumi on one occasion. To steal its target's memory, the Scyphozoa wraps its two front tentacles around them. The victim is then encased in a red aura and rendered immobile. The Scyphozoa then places its three tentacles to a victim's head; two at the victim's temples and one at their forehead. It then begins to drain its victim's memory, which is visible as a pinkish fluid that passes through the Scyphozoa's tentacles and into an organ in its bulb-shaped head, supposedly its brain. If it manages to finish its task, it will drops its victim and floats away. If the tentacles are severed before the process is complete, any data it has stolen is returned to the owner. This runs contrary to the episode "Missing Link", where it still managed to steal Yumi's digital genetic code even though its tentacles were severed. It is possible though that since it was only stealing her digital genetic code it had already finished the process and was either about to drop her anyway or it started stealing her memories which restarted the process. The draining process seems to wear out its victim, as its captives usually feel momentary fatigue. It can also drain life points, as evidenced by the Scyphozoa's attack on the Skid in "The Lake".

As with all of Xana's monsters, the Scyphozoa's proposed weakness is the Eye on its head. Only its head and tentacles have ever been hit though. Its head simply absorbs the attacks but the tentacles are severed when hit. This causes it to lose its grasp on its victim. Getting hit in the head can also cause it to lose its grasp on its victim, though the effectiveness of this varies. This monster has also managed to survive every attack inflicted upon it, including Odd's arrows and Manta mines. This suggests that it might be indestructible or, at the very least, extremely durable, since even non-Eye hits have done no visible damage to it. It is only destroyed once, and inadvertently at that, in "The Lake", when Aelita supercharges the Skid's shields using energy from various towers in Lyoko. As it was connected to the shields at the time, the sudden increase in power overloaded and destroyed it. It also seems to be capable of regenerating its limbs over a short period of time. This is seen in "Déjà Vu", when its tentacles were severed by Ulrich yet it came back whole a few minutes later. Regardless of this, the Scyphozoa retreats whenever it faces any significant resistance. Xana is not willing to risk losing Aelita's memories, so the Scyphozoa can also be persuaded to let her go if the group is willing to destroy her rather than let Xana have her memories. This has only happened once, in "Saint Valentine's Day", where Odd threatened to kill Aelita until the Scyphozoa was persuaded to release her.

In "The Key", the Scyphozoa finally managed to steal Aelita's memories, which contained the keys to Lyoko. The theft effectively killed her, since it took every last memory she had. When it succeeded, every tower in Lyoko became controlled by Xana. As Xana escaped the supercomputer, Sector 5 shut down. It was only through the intervention of Franz Hopper that Sector 5 was restarted and all of the towers were purified. His intervention also brought Aelita back to life and restored all of her memories.

Having completed its original purpose, Xana now uses the Scyphozoa to transfer viruses to Aelita in the third season. This enables him to take control of her, afterwards which he can use her to delete sectors in Lyoko by having her enter the code "Xana" into a sector's passage tower. In the last episode of the third season, "Final Round", the Scyphozoa also takes control of William and uses him to destroy Lyoko's core. It continues to use its viruses to possess Aelita in the fourth season and, on occasion, will be deployed to drain energy from the Skid.

The Scyphozoa doesn't utilize any strategy in completing its goals. It merely waits for a decent opening and proceeds to capture its target. Other monsters are usually deployed alongside it to corner a target, making the Scyphozoa's job easier. The Scyphozoa will not attempt to capture a target if there is significant resistance and will retreat if threatened.

Manta

Vaguely resembling manta rays, Mantas take up residence in Sector 5. They are capable of flight, but look as if they're swimming when doing so, and shriek like hawks. Like the Krabes, their Eye is located on their backs, and is rather large when compared to other monsters. Despite this, they have the most endurance compared to other monsters; a Manta once survived an assault by Ulrich that nearly bisected it. Mantas seem to be Xana's last line of defense against intruders, since they only materialize when Aelita has reached the interface in Sector 5. William also has a black-colored Manta (as opposed to the standard blue) which he uses as transportation.

Mantas have two weapons at their disposal. The first is a powerful laser that can be chained, but at medium-paced speed. The damage caused by this laser is 60 life points. Like with the Krabe, the Eye accompanies the firing of the Manta's laser. They also have the ability to lay floating mines, which resemble floating skulls with the Eye printed on their faces. The mines can either float in place to act as barriers or track their target until they destroy it. The mines detonate upon impacting a solid object, regardless of what that object may be. The Mantas can lay hundreds of mines in rapid succession, allowing them to quickly blockade a target or a specific area, though they will disappear just as quickly after a few are destroyed. The mines cause instant devirtalization should they hit, though the vehicles are capable of surviving a single blast.

Apart from their regular weapons, two Mantas exhibited a unique attack when working together in "Temporary Insanity". By joining at their stomachs, the two Mantas were surrounded by a red aura that enabled them to fire a massive red laser. When the laser struck both Odd and Ulrich, who were riding on Odd's Overboard at the time, they were enveloped in the same aura which eventually devirtualized them. After a short period in the real world, they went insane, believing themselves to be on Lyoko. After returning to Lyoko, they believed themselves to be on Earth.

Being from Sector 5, the Mantas also have a unique trait. Unlike other monsters, Mantas aren't materialized when needed. Instead, they form from lumps on the outside "wall" of the sector in a process referred to as "hatching."

Mantas travel in groups of one to three. They tend to use the same hit and run strategy as the Hornets, but their slower speed allows them to fire more in a single pass. It also makes their passes in general take longer, giving their targets a greater opportunity to counterattack. They can also use their flying mines to chase down or barricade their targets, preventing any means of escape. When facing a stationary target, they use the same circling strategy as the Hornets.

Creepers

Creepers are a type of XANA's monsters, seen only in Carthage. They have a rather humanoid appearance, except for their slithering tail. Creepers can slither along walls, making them ideal to fight Team Lyoko in Sector 5. Their laser, packing moderate firepower, is contained within their mouth.

Creepers are, as their name implies, creepy. Whilst normal monsters explode when they are killed, Creepers explode into a puddle of white goop and nerve cell-shaped parts (perhaps their brains), and even come with the appropriate "squishing" sound effect. The puddle varies in size in various episodes. They can be easily revealed due to their evil-sounding growls and howls. Creepers also get really annoyed if someone executes martial arts on them, like boxing, as seen in the episode Franz Hopper. They also take the hits.

One thing XANA may have overlooked is the Creeper's amount of life points. Creepers have a lower than average 60 life points. Basically, the eye is just there for decoration, as it really isn't necessary to hit them there. XANA has little regard for the Creeper army's status, as he openly collapses parts of Carthage that kill the Creepers to get at Aelita in The Key.

Kankrelats

Kankrelats, referred to as Roachsters in the first season, are the smallest and weakest of Xana's monsters, being light enough for the warriors to kick around. They are fairly fast when they want to be, and are excellent dodgers thanks to their small size. They can also leap a considerable distance through enough speed and cling to objects with their pointed feet. The weak point of a Kankrelat is the Eye on its carapace. They are the least intelligent of Xana's monsters.

Kankrelats are equipped with a weak laser cannon below its carapace which causes only 10 points of damage per hit, the weakest of any monster. It also cannot be fired rapidly, so Kankrelats have to employ the same mass-fire techniques as the Hornets in order to be effective. A small spinning laser effect, which represents the weapon charging, precedes the firing. The Kankrelats occasionally run with their lasers pre-charged.

Kankrelats were the first monsters materialized in the real world. Reflecting their power, their laser blasts only burned through clothing but caused average harm. Kankrelats were also the only monsters teleported to the site of a Replika's supercomputer to attack the heroes, during the episode "Hard Luck".

Kankrelats usually move in groups of five to make up for their poor individual power. They will single-mindedly chase their target, regardless of where that target goes to evade them or what dangers happen to be in their way. They will also attack a target relentlessly, regardless of how futile such an action may be in some circumstances. They will occasionally attack from multiple fronts, but usually attack from a single direction.

From the second season onward, the Kankrelats have become the comic relief on Lyoko. In "Attack of the Zombies", a Kankrelat tried to chase Aelita into a tower, only to bounce off of the surface and fall on its side. It then proceeded to run in a circle without getting up. In "Ultimatum", three Kankrelats fall down an ice tunnel in a "Three Stooges" fashion. The first one stops in time to look down the tunnel, the second bumps into the first, and the third crashes into them, causing all three to fall into the tunnel, blasting randomly (and hitting each other) as they do. In the episode "Double Trouble", one of Xana's clones causes bugs in Odd and Yumi's profiles, leaving them immaterial on Lyoko. Despite the fact that their lasers pass right through Odd and Yumi, the Kankrelats continue to fire pointlessly for some time, eventually stopping and just circling their foes, passing right through them occasionally. Throughout the final three seasons, Kankrelats also tend to become the brunt of the warrior's physical jokes, such as being kicked around by Ulrich in "Tip-Top Shape" and Odd in "Double Trouble". Finally, they share the misfortune of being devirtualized by ally monsters when a shot intended for a warrior misses.

Megatank

Resembling a massive sphere, Megatanks are one of the most rarely seen and arguably the most dangerous of Xana's monsters. In fact, they have made the least appearances (Despite being the second monster introduced in the show, first being Kankrelats) of any normal monster and do more damage than any other monster. The weak points of the Megatank are its two Eyes, which are located opposite each other on a support ring inside its casing. The casing is able to resist any attack, even one from another Megatank (although it doesn't cancel out the force of the attack). It only opens this casing when preparing to fire, making it all the more dangerous to attack. Fake Eyes appear around its equatorial axis before it opens, as a sort of warning.

Megatanks move by rotating the two halves of their casings. This unique method of propulsion allows them to travel faster than anything on Lyoko, including the vehicles, but only marginally so. Megatanks lack the ability to slow themselves down quickly, which can lead to them falling into the digital sea through their own excess momentum. For this reason, they are rarely seen in the Mountain sector. Megatanks have some limited mobility beyond rolling their cases; if knocked on their side, they can realign themselves before rolling again. Their weight and speed also enables them to flatten and devirtualize the warriors if given the chance. The Megatank is the only monster on lyoko able to block all of the Lyoko Warrior's weapons, as long as its shell it closed, it can also withstand Aelita's energy field.

The Megatank's only weapon is its massive elliptical laser, which is charged and fired from the support ring inside its casing. This circular setup allows it to fire both behind and ahead of itself simultaneously. Alternatively, the Megatank can rotate on its side and fire sideways, creating a nearly unavoidable attack if the lyoko warriors are on ground. The Megatank's laser has one of the longest ranges of any weapon, and fires as a solid pulse instead of a short burst. However, due to this setup, the weapon must reach its destination and retreat before the Megatank can fire again. Though the Megatank can fire rapidly if need be, it needs to pause every so often to recharge its weapon. Megatanks normally fire their attack while stationary, though they can fire it while running, albeit with greater difficulty. The Megatank's laser only did fifty points of damage per hit at first, but started to do one hundred points of damage per hit after the episode "Code: Earth". The official site has both damage totals listed.

Before the episode "Code: Earth", the Megatank's laser was usually impeded when it struck someone or something, allowing the others to shield Aelita with their body, but with the damage increase, they can now shoot straight through any of the heroes, making the previous strategy of self-sacrifice useless. In addition to that, the Megatanks became the only monsters with a weapon capable of altering the landscape of Lyoko. It can cleanly slice through most objects on Lyoko, though a sufficiently thick object will stop the attack. Strangely, the Megatank doesn't damage the ground it is on when firing its laser. Aelita and Ulrich have weapons capable of blocking the Megatank's laser, but the force behind the blast prevents them from doing so for long. Ulrich's solid weapon is less effective than Aelita's energy-based one, so he has more trouble stopping the attack. It can actually shatter his sword if given enough time. Aelita, however, can shatter the Megatank's laser itself with two energy fields; the attack scatters the laser into glass-like pieces of energy in every direction that disappear after a short period.

The Megatank is also the only monster powerful enough to damage a tower, other than the specially-created Kolossus. Megatanks have attacked towers twice so far. The first time was in the first season episode "Code: Earth", in order to prevent Aelita from reaching the real world. The second time was in the second season episode "Contact", in order to shut down a tower being used by Franz Hopper. When they cause enough damage, the tower that they're attacking shuts down completely. They failed the first time, but succeeded the second.

Megatanks usually travel alone, but will travel in groups of two or three if Xana is desperate. Their strategy is fairly simple, but overwhelmingly effective in most cases. They keep their outer shells closed until they're ready to attack, then close them right after doing so. This makes damaging them quite difficult. Their speed also allows them to keep in range of their targets easily, preventing any escape. In the Mountain sector, they can use their massive laser blast to blockade smaller paths. Since their attack and invulnerable shell prevents effective close-range combat, Odd has the best record against the Megatanks. At the end of one episode Jeremy supposedly went into Lyoko for the first time(however it was never shown), and had just come out of the materilaztion room. During Ulrich joked about how fast a Megatank finished him. That was the only known time he went into Lyoko to battle, after which he never entered again. It was never revealed Jeremie would look like in Lyoko though Odd and Ulrich says that he looks ridiculous.

Tarantula

Resembling a giant semi-organic spider with four jointed legs and six small, red eyes located near the tip of their head, Tarantulas are one of Xana's most powerful monsters. With a higher-than-average 125 life points, higher than average intelligence (surpassing the Krabes), and the vulnerable Eye on the top of their head, Tarantulas are quite difficult to destroy and a single one can easily wipe out the team by itself. Tarantulas were the first new monster introduced in the second season.

The Tarantulas weapons are the laser cannons on the tips of their front legs. These lasers cause 20 points of damage per hit. Tarantulas don't need to charge their lasers beforehand, though they can charge their lasers for more powerful shots that cause fifty points of damage per hit. While the lasers are powerful, they can be disabled if the Tarantulas cannons are severed by a warrior's weapon. To fire their cannons normally, Tarantulas must first seat themselves on their hind legs while holding up their front legs. While each laser cannon can only be fired at medium-paced speed, with proper timing, the Tarantula can chain each shot to create a near-continuous stream of laser-fire. The position of its limbs allow for a 180° field of fire, allowing it to keep up its attacks without stopping to adjust its position.

Since the Tarantula fires its lasers while seated, however, its movement is limited to its field of fire, affording it few opportunities to escape in battle. The Tarantula isn't completely immobile in combat; it can run on its hind legs to take long-distance shots, though it can only fire a few times before falling back onto all fours. It can run fairly fast compared to the other monsters thanks to its fairly long legs, but can't climb nor balance well due to the cannons on the tips of its legs, limiting it to relatively flat surfaces. Slippery or slanted surfaces, especially those in the Ice Barrier sector, cause them to slip.

Tarantulas, like the Creepers, also tend to explode into nerve-like body parts, along with the regular mechanical pieces when destroyed. Additionally, a Tarantula in "Lyoko Minus One" is destroyed uniquely when the sector it is in is deleted. Its body glowed orange and it fell apart. In "Hot Shower", when Xana calls off his attack, they turned to a whiteish-pink dust.

Unlike the original monsters, Tarantulas have a habbit of grunting and roaring on Lyoko. These roars can act as a means of communication between two or more Tarantulas, but normally serve to indicate their mood (preapred for battle, victorius, agitated, etc.).

Tarantulas usually travel alone, but will travel in groups of two to four to protect a tower. The Tarantulas' strategy usually involves guarding a target, since their method of attack prohibits them from moving while firing. In the instances where the chase a target, they will try to run their prey into a corner, allowing them to fire rapidly. When fighting a group, they will simply sit in one place and fire, changing position as necessary. If two or more Tarantulas battle a group, they will mass their fire from a single direction to increase the odds of devirtualizing a warrior.It usally with Odd it takes all of his lazer arrows to destory it.

Hornet

Resembling a mosquito without legs, Hornets (also known as Waspsters) (fr: Frelions/Frôlions) are one of the two flight-capable monsters, the other being the Mantas. Hornets have ten thin wings, five on each side of their bodies, which allow them to fly at speeds rivaling those of the vehicles. The Eye of Xana dominates their forehead, and their small size makes them easy to dispatch regardless of where they are hit; however, their speed and maneuverability makes hitting them quite difficult.

Hornets carry two types of weapons. The first is a laser equipped on their stinger-like tail that causes 20 points of damage. They fire it by jabbing their tail at a target like a stinger. In season one, they were able to attack rapidly with this weapon,but this was removed in season two onwards. They make up for this by massing their fire. The second, albeit rarely used weapon, is a massive proboscis that can spit corrosive. acidlike poison. The poison drains life points from everyone touching it at a rate proportional to how much is present. Poison-bearing Hornets have thirty additional lifepoints. Hornets usually travel in groups of three to five,in order to mass their fire and cause more damage to the warriors. They utilize their speed to do attack runs on targets, quickly flying in with a barrage of lasers and leaving just as fast. When a target is in a confined space or immobile, they will circle around the target and fire from all angles. The groups of three to five have one leader and two to four wingmates. Supposedly, destroying the leader might destroy its wingmates, but this has never happened. Hornets can destroy themselves (mostly on the mountain sector) by smashing themselves to certain places like mountains or on the ground. with their own speed if they're not careful of where they are going.

Krabs

Resembling an overgrown crab without the pincers, Krabes are one of the strongest monsters in Lyoko. Krabes have four large, jointed, scythe-like legs, allowing them to easily climb any surface, though they rarely do so. In the episode "Plagued", three Krabes were able to walk effectively on a surface tilted at a 90° angle. They appear to bear a higher level of independence than most of Xana's monsters, and may also have the best aim. The Krabe's Eye is on its back, making it difficult to hit. However, the Eye is massive compared to other monsters, and thus easy to hit from above.There were a couple of times where the eye was not hit to destroy it. Ulrich, on multiple occassions, is able to pierce through a Krab's stomach, hitting the eye from underneath. Yumi also destroyed it by slicing off two of its front legs.

The Krabes have four separate weapons. Its main weapons are two tri-lasers, placed on top of one another on the front of its shell. The main laser deals 40 points of damage while the ventral laser (on their underbelly and more difficult to aim) deals 80 points of damage. Either one can be fired rapidly. These lasers have a unique visual effect. When either laser is fired, a large, upside-down flash of the Eye accompanies the firing. Its third weapon is a pulse weapon located on their stomach. Though this weapon has yet to hit a foe, it is believed to cause instant devertualization in a hit. Finally, its legs can be used as stabbing weapons for instant devertulization. The krabes have never done this in Lyoko, though. When they were sent to the real world, they used their legs to pin their victims to the ground.

Krabes were the second monsters materialized into the real world, but their size caused them to destroy the scanners that produced them, limiting the total number to three. When in the real world, their lasers caused a fair amount of damage to whatever they hit, unlike the Kankrelats. They also used their scythe-like legs to pin their victims to the ground, making eliminating them much easier.

Krabes normally travel in groups of two or three, though they are quite capable of defending themselves alone. However, in the episode: The Chips Are Down Xana possesses Nicolas and bugs up the Supercomputer. This caused any damage taken on Lyoko to feel real. The other bug implanted caused (It is unknown whether or not this increased Xana's power) Xana to be able to create a literal army of Krabes. Krabes take a straight-forward approach to fighting, preferring a direct assault to any form of strategy. This tends to work fairly well when they're in groups, but not so well when they're alone. When alone, they are easily tricked or avoided. Although their scythe-like legs enable them to easily traverse gaps in most sectors and walk along plateaus tilted at 90° angles, their size and limited range of vision discourages close-range combat. They are usually pitted aganist Yumi.

Block

Blocks are one of the most common of XANA's monsters, and one of the weakest. They inhabit the Ice Barrier, Desert, Forest, and Mountain Sectors. Blocks have four Eye of XANAs, each one situated atop a different type of laser or mechanism. One of the eyes is a standard laser, one a Freeze Ray, one shoots Fire Rings, and last Eye covers the brain. The lasers and fire rings do 30 points of damage. If any one of these eyes are hit, the Block automatically dies. Blocks are moderately intelligent, but in some cases, they are quite unintelligent. One thing that supports Odd's above statement is found in the episode Frontier, where Aelita is being chased by two Blocks in the Mountains. The Blocks come across a gap and attempt to jump. One of the Blocks accidentally bumps into the other and loses too much speed and falls into the Digital Void (the other Block made it, though). They won't jump off to their doom in a desperate attempt to catch a Team Lyoko member, but instead carefully time everything. Blocks usually attack in groups, one herd containing a record breaking number of 46 bloks, as seen in the episode Ghost Channel. Blocks can rotate their heads on the axises which connect them to their six-legged lower bodies, and each Eye can see and lock onto enemies. They can also defy gravity by climbing upside down and on the side of things.

Odd claims in The Girl of the Dreams that Blocks are his favourite monsters.

Blocks are basically cubes on legs. They have six legs compared to the usual four seen on other monsters, allowing them to balance on surfaces that other monsters would plummet from, like peaks in the Mountain sector.

Each Eye on the Block's cube-shaped head has a different function. Despite having different functions, these eyes look identical and can't be distinguished from each other. This has worked in the Blocks' favor on a few occasions, but is usually not a concern. The front Eye is the brain, the right Eye is a laser, the left Eye fires a freeze ray, and the rear Eye shoots pulses of fire rings. Each weapon has a specific glow before firing: red for lasers, light-blue for the freeze ray, and orange for fire rings. The laser and fire rings each do thirty points of damage per hit. Either one can be fired rapidly. The ice beam fires as a continuous stream and has several different effects. It can either freeze part of someone's body, forcing them to chip the ice away, or it can freeze them entirely. If someone is completely frozen, they are either devirtualized or stuck frozen for three minutes. So far, Ulrich is the only one out of the group to have been completely frozen by the ice beam. This might be due in part to his style of combat, which focuses on blocking attacks instead of avoiding them. The ice beam has proven largely unblockable, though it may have just been either good timing on the part of the Block, the inability to block specialized attacks with the sword or the fact that they have only used this ability when their targets were caught off guard. A Block has accidentally frozen its companion on one occasion, but the freezing did not devirtualize it. The Block actually tried to fire through its companion after doing so.

Blocks usually appear in groups of two to four, sometimes burrowing their way out from under the ground as seen in "Mister Pück". The Blocks are persistent and clever, though single-minded in the pursuit of a target. The Blocks will use their climbing ability to sneak up on targets and their unique array of weapons to devirtualize them. Their single-mindedness causes them to make mistakes, however, providing some comedic results. They also tend to ignore most forms of danger, but will dodge attacks.

XANA's Monsters

To defend his towers and to battle the group in Lyoko, Xana creates and sends monsters to devirtualize them. Each of Xana's monsters has a common trait: the Eye of Xana. This serves as their weak point and, in some cases, an actual eye. A single hit to this part of their body with one of the warrior's weapons will destroy it. They can also be destroyed in other ways, such as being hit by a partner's laser by accident, struck against walls, cast into the digital void, or crushed. With a few exceptions, each monster also has a laser weapon of varying strength, as well as secondary weapons in some cases. The monsters have varying levels of intelligence, which is often directly related to their overall strength. Finally, the monsters usually have fifty life points unless otherwise noted.

Most monsters have the ability to aim their laser, though they do not seem to do so often. This is shown from the monster's point of view, which is dominated by a trisected, white circle. When targeting something, an upside-down, red triangle follows what they intend to shoot. When it locks on, the red triangle centers within the circle and three red lines connect each vertex of the triangle to the circle. Only a few monsters have directly demonstrated this targeting system, but it is safe to assume that others utilize the same system.

Finally, due to natural faults in translation, it is not unknown for a monster to be renamed in the English version. This is most commonly seen with the Frelions/Frôlions, which are called Hornets or, rarely, Waspters. The Kankrelats were also called Roachsters in the first season, but they are now called by their original name. Each monster is listed with its current English name. Unless otherwise noted, their name in French is the same as it is in English.