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Not to be confused with Chao.

You know nothing, fool! It's Chaos, the God of Destruction!

Doctor Eggman, Sonic Adventure

Chaos (カオス Kaosu?) is a character that appears in the Sonic the Hedgehog series. He is an immortal mutant Chao and a godlike figure[3] who serves as the guardian who was worshipped by the Knuckles Clan prior to their negative turn of events, as well as the Chao and their friends.[4][5] His body is composed entirely of concentrated energy,[3] and he has the ability to change form and evolve with each Chaos Emerald that he absorbs.

The first known guardian of the Chaos Emeralds,[3] Chaos watched over a Chao colony in ancient times. However, 3,000 years ago, an attack from the Knuckles Clan led to him being consumed by a fury that threatened to destroy the world, but he was sealed in the Master Emerald before he could succeed.[2] In recent times, he was released by Dr. Eggman for a plot to conquer the world. Despite initial cooperation though, he eventually revolted and tried to destroy the world. Fortunately, he was soon calmed by Sonic and departed for heaven in peace.[6] Since then, Chaos has only re-emerged in times of great crisis.[5]

Concept and creation[]

For Sonic Adventure, Sonic Team wanted to introduce a new enemy that was bigger and separate from the already-established main antagonist, Dr. Eggman, an enemy which could match up to the impact that Sonic Adventure was going to make by being a bigger Sonic game than any of those before it, namely by taking advantage of the technological jump from the Sega Mega Drive to the Dreamcast. Takashi Iizuka in particular wanted to design an enemy that had not been possible until now due to the limitations in technology. With Iizuka wanting something transparent and liquid since the technology now allowed it, the team came up with Chaos. Chaos was designed to impress the players and appear both bigger than Sonic and much more powerful than any enemy before him. It was for these reasons that the team wanted Chaos from the beginning and introduced him as the first boss of the game in order to emphasize the greater scale of Sonic Adventure in comparison to previous games.[7]

When the team first designed Chaos, they presented the drawing to Yuji Naka, who was so impressed with the idea that he approved of him on the spot.[7]


Chaos is a lifeform with a body made of water-like energy. There are numerous forms he can take, although his most recognizable one is his Chaos 0 state. In this state, Chaos possesses a humanoid form with disproportionally long arms and legs compared to his torso. He has thick forearms with three large fingers on each hand, a short stump for a tail, and long feet with two large toes each. He also has two fin-like protrusions on the back of his head, sharp flaps on each side of his head, and a tall bulge on top of his head. He also possesses no facial features, except for two pupil-less lime green eyes. Lastly, he has a round pink brain inside his transparent head, with a brain stem on the bottom.


Said to have a warm heart,[4] Chaos is primarily a very loving and gentle creature who cares dearly for the Chao he protects.[8] Mainly watching over the Chao as an inert pool of water, he only becomes active in times of danger, and only attacks when the Chao needs protection. However, he is noted to have a bad temper;[9] after seeing his sacred precincts being invaded by Pachacamac and his men, Chaos became filled with anger and sadness.[10]

Following the attack on his precinct three thousand years ago, Chaos became corrupted by his own negative emotions, causing him to forsake his peaceful and passive ways and become a rage-filled monster driven only by his own immeasurable anger. His fury proved to be so great that he wanted nothing more than to destroy the world out of spite, even after getting revenge on those responsible for angering him in the first place. In his corrupted state, Chaos remained eternally determined and vengeful, as his desire to bring the world to ruin persisted even after three millennia. However, after Super Sonic neutralized it, Chaos returned to his previous peaceful and gentle demeanor from then forth.

Powers and abilities[]

Chaos is an incredibly strong creature whose power is so great that he is revered as a deity. Even at his weakest, he is said to possess immeasurable powers.[4]

Hear this, Sonic! Chaos' strength increases every time I give him a Chaos Emerald. All he needs is 7 Chaos Emeralds to become invincible!

Doctor Eggman, Sonic Adventure

Chaos possesses the ability to absorb the energy of the Chaos Emeralds, allowing him to achieve different transformations with every Emerald that he absorbs, increasing his strength in turn.[1] In addition, he is an immortal being.[3]


Chaos 0[]

Main article: Chaos 0
Chaos 1

Chaos 0, from Sonic Adventure.

Chaos 0 is Chaos' most basic form, assumed when he is possession of no Chaos Emeralds. In this form, Chaos commands limited hydrokinetic shapeshifting, allowing him to stretch his limbs, morph its body parts, and liquefy himself into a puddle of water. He is also bulletproof due to his watery composition and possesses earthquake-inducing super strength. He can also harness the power of spirits and elementals to perform great physical feats (like several tens meters tall leaps), execute strong attacks, and even heal himself. He also has hydrokinetic powers that lets him emit mysterious ripples and even freeze the air around his foes. In addition, he can climb, glide and breathe underwater.

In addition to his wide skillset, Chaos 0 also has very strong combat skills,[1] enough to take on Knuckles the Echidna, who is master of martial arts.[11]

Chaos 1[]

Chaos1-sonic adventure

Chaos 1, from Sonic Adventure.

Chaos 1 is the form Chaos takes after absorbing the negative energy of one Chaos Emerald. In this form, Chaos increases in size and mass, and he gains a line of bones that travel down his right arm into his hand.

Most of Chaos 1's abilities are unknown. although he retains his power of hydrokinetic shapeshifting, allowing him to liquefy himself into a puddle of water.

Chaos 2[]

Main article: Chaos 2
Chaos 2 new

Chaos 2, from Sonic Adventure.

Chaos 2 is the form Chaos takes after absorbing the negative energy of two Chaos Emeralds. In this form, Chaos becomes larger and more muscular with a hunched posture, bones in both his large arms, and vertical hammerhead fins.

As Chaos 2, Chaos is much stronger, and his hydrokinetic shapeshifting has evolved significantly, allowing him to turn into a large ball, liquefy over a wide area and split into hundreds of balls. He can also stretch his limbs over a wide range and generate a force-field around itself.

Chaos 4[]

Main article: Chaos 4
Chaos 4 new

Chaos 4, from Sonic Adventure.

Chaos 4 is the form Chaos takes after absorbing the negative energy of four Chaos Emeralds. In this form, Chaos looks like an aquatic creature, similar to a shark, with arm-like fins, a dorsal fin, and a blunt horn. He also has bones in his tail section and arms.

As Chaos 4, Chaos' hydrokinetic shapeshifting has evolved further, allowing him more offensive usage of his shapeshifting. he also has new abilities to match his new form, including more control over water and energy wave emission. He is also a quick and nimble swimmer and is able to levitate in the air.

Chaos 6[]

Main article: Chaos 6
Chaos 6 new

Chaos 6, from Sonic Adventure.

Chaos 6 is the form Chaos takes after absorbing the negative energy of six Chaos Emeralds, making this his penultimate form. In this form, Chaos resembles a scorpion/spider/frog-like creature with six legs, a long tail, multiple eyes, and a toothed mouth. He also has an extended skeleton inside his body.

As Chaos 6, Chaos commands immense power. In this form, his hydrokinetic shapeshifting has reached the point where he can assume more complex forms that feature a variety of tentacles. He has also gained a vacuum breath and can charge his attacks with energy.

Perfect Chaos[]

Main article: Perfect Chaos
Pub boss perfectchaos 01

Perfect Chaos, from the console/PC version of Sonic Generations.

Perfect Chaos is the form Chaos takes after absorbing the negative energy of all seven Chaos Emeralds. In this form, Chaos becomes a giant serpentine dragon-like beast with a mouth extending far beyond its eyes, which are now reptilian, and a scale-like hide instead of a skeleton. The base of his snake-like body is merged with the water around him. He also has large tentacles extending from his base.

As Perfect Chaos, Chaos is a higher being that accordingly commands ultimate power. He is able to merge with water and has immense hydrokinetic abilities that lets him create large-scale water sprouts, command water tornadoes, and control entire floods which are destructive enough to destroy all of Station Square. He also has incredible super strength and can shoot energy blasts from his body and beams from his mouth.


Despite his numerous forms and godlike power, Chaos has one consistent weakness: his brain. This is a weak spot that, when hit, will cause Chaos' form to weaken and destabilize. He is also not well protected in most of his forms. Chaos is also noticeably slower than most other Sonic characters, even in his smallest form, Chaos 0.



Tikal was the only person that Chaos allowed to approach the Chao, as Chaos saw Tikal's caring nature towards them. When Pachacamac attacked the Chao and Tikal, Chaos attacked Pachacamac in revenge but became consumed by evil and rampaged across his empire. Tikal sealed him away until the Master Emerald shattered, causing Chaos and Tikal to be separated from each other. Once Tikal successfully assisted Super Sonic in removing the evil within Chaos, the two ascended into the heavens as peace was restored.


Sonic Adventure DX 2017-01-06 23-50-44-403

Various Chao with Chaos and Tikal, from Sonic Adventure DX: Director's Cut.

As the god of the Chao, Chaos watches over them and rarely allows anyone to approach his temple as it was home to many Chao. When Pachacamac attacked these Chao, Chaos used the Chaos Emeralds to become Perfect Chaos and attacked Pachacamac and his empire in revenge.

Dr. Eggman[]

Sonic Adventure Sonic cutscenes 49

Dr. Eggman with Chaos 1, from Sonic Adventure.

Dr. Eggman managed to shatter the Master Emerald after hearing about the legends of Chaos. He then commanded Chaos as if he was a minion, which Chaos allowed simply because Eggman was consistently able to obtain the Chaos Emeralds that Chaos used to unlock his stronger forms. But when Eggman lost the Chaos Emeralds to Knuckles, Chaos ambushed Eggman and seemingly kept him alive only as a distraction to ambush Knuckles shortly afterward. Eggman, seeking revenge, used his Egg Carrier 2 to attack Perfect Chaos, only for Chaos to destroy the aircraft with a single hit from his mouth beam. In Sonic Battle, Chaos is awakened in response to Eggman threatening the planet, and decides to spar with Emerl so that the latter trains before fighting Eggman.





  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Sonic Channel (Japanese). Characters: Chaos. Sega. Archived from the original on 26 May 2019. Retrieved on 3 July 2015.
  2. 2.0 2.1 "カオスエメラルド伝説" (in Japanese). ソニックアドベンチャー ナビゲーションガイド. SoftBank. 16 March 1999. pp. 156-158. ISBN 978-4797308624.
  3. 3.0 3.1 3.2 3.3 Sonic City. Archived from the original on 29 January 2008. Retrieved on 4 July 2015.
  4. 4.0 4.1 4.2 Sonic Adventure 2: Battle (Nintendo GameCube) United States instruction booklet, pg. 23.
  5. 5.0 5.1 Sonic Team (5 January 2004). Sonic Battle. Game Boy Advance. Sega. Area/Level: Holy Summit (Emerl's Episode). "Knuckles: When that battleship appeared, the 'Estuary' instantly froze over, and 'Chaos' appeared. He's just sitting there, guarding the 'Death Egg.' Chaos is the guardian god of the Chao. He only shows himself in times of great crisis. Looks like we're in deep trouble this time!"
  6. Sonic Frontiers: 123 Rapid-Fire Questions With Takashi Iizuka. YouTube. Game Informer (12 July 2022). Retrieved on 13 July 2022.
  7. 7.0 7.1 Sonic Adventure DX - Director's Commentary (2004). YouTube. The Sonic Stadium (30 August 2015). Retrieved on 6 February 2022. "Takashi Iizuka: As all Sonic fans know, the primary villain in every previous Sonic game as always been the notorious Dr. Eggman. But we knew that in order to make a bigger game, something with much more impact, I wanted to take advantage of the technological jump we made going from Genesis to Dreamcast in a Sonic game. I wanted to create an enemy that hadn't been possible until now. I wanted something bigger. Something... transparent and liquid because the technology now allowed for it. I wanted something that would wow the users. That's when we came up with the idea for Chaos. He was larger than Sonic. And he looked much more powerful than any enemy any Sonic game had ever seen. And that's why we wanted him from the very beginning and included him in the opening sequence. We wanted to make a statement, we wanted to show the users from the very beginning of Sonic Adventure that this game was bigger and better. When we first designed Chaos, we presented the drawing to Naka-san, and he liked the idea so much that he approved of it on the spot."
  8. Sonic Team (9 September 1999). Sonic Adventure. Dreamcast. Sega. Area/Level: Mystic Ruins (Gamma's story). "Tikal: Did you notice the presence guarding these children? He's a very loving and gentle creature."
  9. Sonic Forces: Stress Test, "Stress Test"
  10. Sonic Team (9 September 1999). Sonic Adventure. Dreamcast. Sega. Area/Level: Super Sonic's story. "Tikal: My heart has always been in the Master Emerald, along with Chaos'. Now he's filled with anger and sadness. And If it goes on, he'll eventually destroy the world, like he did before!"
  11. Sonic Team (9 September 1999). Sonic Adventure. Dreamcast. Sega. Area/Level: Super Sonic's story.