Sonic Wiki Zone

Know something we don't about Sonic? Don't hesitate in signing up today! It's fast, free, and easy, and you will get a wealth of new abilities, and it also hides your IP address from public view. We are in need of content, and everyone has something to contribute!

If you have an account, please log in.


Sonic Wiki Zone
Sonic Wiki Zone

Your power will be taken from you! Like mine was...

— Chaos Gamma, Sonic Battle

E-102 (E-102[1] Ī Ichi-Zero-Ni?), codenamed γ or Gamma (ガンマ[1] Ganma?), and also known as Chaos Gamma (カオス・ガンマ Kaosu Ganma?), is a character that appears in the Sonic the Hedgehog series. He is a robot created by Dr. Eggman that is modeled after E-102 Gamma, being a prototype[2] built with recovered parts from him. During the Emerl incident, Gamma served as the doctor's principal robotic enforcer during his operations to control Emerl and made numerous attempts to capture the robot for his master.


Chaos Gamma looks much like E-102 Gamma, except Chaos Gamma has another hand where E-102 Gamma had a missile launcher. Chaos Gamma also possesses several more weapons than E-102 Gamma, such as a grenade launcher and an electric dagger, but lacks the "headlight" mounted on E-102 Gamma's chest.



According to Rouge the Bat, Chaos Gamma was constructed by Dr. Eggman as a part of the doctor's experiments using Chaos Emeralds on robot cores as power sources for his combat mechs. In these experiments, Dr. Eggman used parts from older or destroyed robots to create guinea pigs for his experiments. Chaos Gamma himself was created as a part of this robot line, presumably from the salvaged remains of E-102 Gamma, who was blown up on the first Egg Carrier. His robot line however was shortly postponed for the activation of the robot Emerl, an act that would play a part in events to come.

Sonic Battle[]

During Dr. Eggman's experiments with the Emerl in Sonic Battle, the doctor implanted a whole Chaos Emerald into the Gizoid. Learning of this act, Chaos Gamma developed a deep sense of resentment and jealousy towards the Gizoid, as Chaos Gamma believed that the Chaos Emerald should have gone to him and blamed the Gizoid for stealing the emerald and its power from him. When Dr. Eggman learned that the Gizoid had been activated, after he had thrown it out, the doctor deployed Chaos Gamma to retrieve the Gizoid, now named Emerl, from Sonic the Hedgehog and his friends. Thus began Chaos Gamma a quest to not only complete his master's mission, but also to take revenge on Emerl.

Chaos Gamma first appeared before Emerl, when Sonic and Tails were heading to Knuckles to get a Chaos Emerald from him. Chaos Gamma was initially mistaken by Sonic and Tails as E-102 Gamma, but the robot quickly revealed his true colors as he moved in to capture Emerl. Despite having his recovery mode restore his power once, Chaos Gamma was defeated by Sonic, Tails and Emerl, and he retreated.

When Tails and Emerl later came to Knuckles from Central City, Chaos Gamma tried to intercept the trio at the nearby bridge, where he engaged them in battle. After the first round, Tails tried to ask him if he was E-102 Gamma, but Chaos Gamma ignored Tails' question, before restoring himself and began fighting again. Eventually, Chaos Gamma was held back by Knuckles alone, allowing Tails and Emerl to escape.

Chaos Gamma eventually managed to escape Knuckles, and later located Emerl again, this time with Rouge, who had just kidnapped Emerl and was taken taking him to Club Rouge. Upon seeing Emerl, Chaos Gamma, who Rouge mistook him for a Guard Robo resembling Omega, entered his battle mode and began fighting the pair, but was defeated and was forced to retreat.

Some time later, Chaos Gamma found Emerl with Knuckles, who were heading to Night Babylon to find one of the E-121 Phi robots. Chaos Gamma ignored Knuckles as he questioned the robot, and began fighting the duo, but was defeated. Chaos Gamma managed to recover, however, and began a second round with Knuckles and Emerl, but was defeated again, and ran away as he once again failed his mission. As Knuckles and Emerl later made their way to the Gimme Shelter, Chaos Gamma was promised a whole Chaos Emerald from Dr. Eggman if he managed to take care of Knuckles and Emerl once they arrived, and Chaos Gamma more than willingly accepted the offer. When Knuckles and Emerl finally arrived, the doctor managed to trap Knuckles and then sent Chaos Gamma to finish them while he escaped. Now more determined than ever, Chaos Gamma pushed his power out-put beyond his limits and began fighting Emerl, but was defeated by the Gizoid. Chaos Gamma however, refused to be defeated and pushed himself even further, but was defeated by Emerl once more. After the fight, Chaos Gamma's energy source was too drained to continue battling, and he left the duo.

Despite suffering continuous defeats, Chaos Gamma continued to hunt down Emerl. He eventually located Emerl with Amy Rose, and Amy mistook Chaos Gamma for her old rescuer E-102 Gamma. Chaos Gamma then moved in to attack, but Amy then asked confused him if he was E-102 Gamma, to which Chaos Gamma replied that his memory did not contain that name and that he was not E-102 Gamma. Chaos Gamma then began fighting Amy and Emerl but was left defeated and unable to fight any more, thus forcing Chaos Gamma into retreat.

Around the time when Cream, Cheese and Emerl were kidnapped by Dr. Eggman and were held captives in the Gimme Shelter, Chaos Gamma was given an Emerald Shard by Eggman to increase his power. While patrolling the shelter, Chaos Gamma was surprised when he ran into Cream, Cheese and Emerl, who were trying to escape through the ducts. Upon their introduction, Chaos Gamma promised Emerl that things would be different now that he had an Emerald Shard and that he would use it to crush Emerl and take his Chaos Emeralds. Letting out all his boiled up emotions, Chaos Gamma began pummeling Emerl in sadistic delight, while Emerl refused to fight as he did not want Cream to cry over the violence in a fight. As Chaos Gamma finally prepared to destroy Emerl, however, Cream and Cheese told Chaos Gamma to back off, but Chaos Gamma arrogantly asked what they could do to stop him and they began fighting. Despite Cream and Cheese putting up a good fight, Chaos Gamma easily recovered from the damage they inflicted. As he recovered, however, Cream, Cheese and Emerl managed to run away. Chaos Gamma chose not to chase after them, however, as he knew the ducts were the only way out and waited for them to return.

True enough, Cream, Cheese and Emerl soon returned, now all three ready to fight, and Chaos Gamma promised vengefully that he would take Emerl's Chaos Emeralds from him, like what he believed Emerl did to him. Chaos Gamma was defeated in the insuring battle, but he absolutely refused to be defeated again. Restoring himself and pushing his power to its maximum, Chaos Gamma called upon a Guard Robo to aid him, but was defeated once more. After the battle, Chaos Gamma stood by and could not understand why he kept losing. Cream then asked Chaos Gamma what he was fighting for, and Chaos Gamma expressed his bitterness and jealously at Emerl for stealing his intended shard. Cream, however, reasoned with the robot, telling him that power was something you used to help those dear to you, and, after some long thoughts, Chaos Gamma found his shard being passed onto Emerl.

After these events, Chaos Gamma still wanted to destroy Emerl, and later found him with Shadow. Having been told by Eggman that Shadow was the enemy as well, Chaos Gamma tried to destroy them both, but was defeated. Chaos Gamma could not understand how he could lose as he had even managed to possess an Emerald Shard and tried to fight resume his fight with Shadow and Emerl but was defeated once more. After the battle, Chaos Gamma was left so damaged that he could not move and began to malfunction. Shadow and Emerl then left Chaos Gamma lying in the streets, where he continuously repeated "destroy", while Emerl pitied Chaos Gamma's fate, which was the price he had to pay for serving as a weapon of Eggman.

After that, Chaos Gamma was repaired, and seemingly relinquished his grudge against Emerl. He then remained in Gimme Shelter where he offered to be a friendly sparring partner for Emerl before he went to stop the Final Egg Blaster, though it remains unclear why Chaos Gamma was doing this.

After this, it's left ambiguous what happened to Gamma as he isn’t mentioned nor seen in any subsequent games. Although, it could be possible that Eggman had no more use for him, and left Gamma on his own free will.


Unlike E-102 Gamma, Chaos Gamma does not act quite as free-willed as E-102 Gamma was, as he follows Eggman's orders without question, but speaks somewhat less robotic. It is revealed that Gamma's personality is enhanced with the power of emeralds, much like Emerl, as exhibited by his more emotional, human-like dialect.

As Chaos Gamma revealed more of his personality, he unveils a rather bitter, vengeful and violent personality which was spawned by his jealousy of Emerl because the Gizoid was given the doctor's Chaos Emerald. As such, besides following Eggman's orders when capturing Emerl, Chaos Gamma operated partially on his own agenda, seeking out Emerl to take revenge on him and obtain the power that was "rightfully" his. Chaos Gamma also shows a rather sadistic side of himself, taking great pleasure in pummeling Emerl when he and Cream tried to escape from Gimme Shelter.

The only time where Chaos Gamma ever showed a soft side of himself was when he was reasoned with by Cream. After the young girl told him that power was not something to take or give, but was meant to be used to protect loved ones, which he did not have, Chaos Gamma chose to leave Emerl and Cream, rather than continue his revenge. From then on, Chaos Gamma displayed more calm and composed behavior when facing Emerl, but could not truly stay off his thirst for revenge as destroying Emerl was still in his interest, even after talking to Cream. However, in the end, he gave up his efforts and aided Emerl in his training.

Powers and abilities[]

As Chaos Gamma is built from many of the original E-102 Gamma's parts, he possesses many of his predecessor's abilities, but further improved. Additionally, he was created with the latest technology available,[3] and being part of the E-Series, he is a very advanced robot that packs impressive firepower.[4]

Like the original Gamma, Chaos Gamma can switch through various "modes" that give him different attributes and features. His default mode is Walk mode, where he can simply walk around, though at a rather slow pace.[3] For travel though, Gamma can also go into Wheel Drive mode, allowing him to reach farther distances faster.[5] To jump, he goes into Ascend mode, where he uses his booster in his back;[6] and to hover, he can activate Flight mode, in which he transforms his chest into a propeller.[7] To protect himself from attacks, Gamma can go into Emergency Avert mode, where he automatically lowers himself.[8] If damaged, he can quickly self-repair his systems with Recovery mode, allowing him to easily recover from strong attacks.[9][10] When engaged in combat, Gamma initiates Battle mode, in which he can use his battle arsenal.

Sonic Battle E-102 Upper Electric Shock

Chaos Gamma using his built-in modes for combat, from Sonic Battle.

As a battle mech, Chaos Gamma is built for combat and possesses several weapons and equipment to increase his battle prowess along with high physical strength. During fights, Chaos Gamma can make his weapons appear on his body whenever he needs them. These new weapons include a large hand named the Solid Knuckle, a claw-like weapon named the Paralyze Dagger which can replace the arms to discharge electricity and fire energy blasts, two large drills named the Buster Drill, and a shoulder-mounted grenade launcher known as the Blinker. He can also activate a manual reactor meltdown, where he creates a massive explosion that damages him and everything around him, and will initiate a self-destruct sequence when knocked out. It does not utterly destroy Chaos Gamma, but damages everyone close to him.

Chaos Gamma can also harness Chaos Emerald energy from Emerald Shards and Chaos Emeralds to serve as his power source and increase his overall power.


Despite being equipped with the latest technology, Chaos Gamma's movement is rather slow,[3] and many of his battle techniques take some time to be performed.





  • The way Chaos Gamma was softened up by Cream parallels how Amy convinced E-102 Gamma to help her.
  • At the beginning of Emerl's story, Eggman states "Um, the Phi's were all destroyed... Chaos and Gamma are useless, too." This is likely a translation error as Chaos had not appeared at that point in the game, and does not work for Eggman during the game.
  • Chaos Gamma and Chaos are the only playable characters in Sonic Battle that do not have a story mode.
    • They are also the only unlockable playable characters in Sonic Battle.

See Also[]










  1. 1.0 1.1 "キャラクタ" (in Japanese). ソニックバトル最強攻略ガイド. Shogakukan. 10 January 2004. p. 54. ISBN 978-4091061409.
  2. ガンマ (Japanese). ナ力マだ!. Sonic Team. "かつて一羽の小鳥を助けるために記憶を失ったロボット。Dr.エッグマンの試作品のため動作は遅いが、高い攻撃力と一発逆転ができる必殺ワザをもつ! [A robot that once lost its memory to help a small bird. It's a prototype of Dr. Eggman, so it's slow, but it has a high attack power and a deadly trick that can be reversed in one shot!]"
  3. 3.0 3.1 3.2 Sonic Team (27 February 2004). Sonic Battle. Game Boy Advance. Sega. Walk Mode - E-102's running skill. While it uses the latest technology, E-102's bipedal movement is still rather slow."
  4. Sega (22 July 2016). Act:005 創造主の傑作プレゼン. Sonic Channel. Archived from the original on 17 April 2022. Retrieved on 21 May 2022.
  5. Sonic Team (27 February 2004). Sonic Battle. Game Boy Advance. Sega. Drive Mode - E-102's dashing skill. It goes into Wheel Drive mode to move faster."
  6. Sonic Team (27 February 2004). Sonic Battle. Game Boy Advance. Sega. Boost Jump - E-102's jumping skill. It goes into Ascend mode to use its booster on its back to jump."
  7. Sonic Team (27 February 2004). Sonic Battle. Game Boy Advance. Sega. Flight Mode - E-102's air action. It goes into flight mode and produces a propeller from its chest that enables it to hover."
  8. Sonic Team (27 February 2004). Sonic Battle. Game Boy Advance. Sega. Guard Mode - E-102's guard skill. It activates its Emergency Avert mode, which quickly allows E-102 to lower itself."
  9. Sonic Team (27 February 2004). Sonic Battle. Game Boy Advance. Sega. Recovery Mode - E-102's heal skill. Initiates recovery mode to heal damage."
  10. Sonic Team (27 February 2004). Sonic Battle. Game Boy Advance. Sega. Area/Level: Gimme Shelter (Cream's Episode). "Gamma: Not bad... But I can easily recover from this level of damage... ... ... ... Auto-check start... Recovery initiated... ... ... ..."