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Dr. Robotnik... Enemy. Master registration... Deleted. E-Series... Friends. Must save...

— E-102 Gamma, Sonic Adventure

E-102 (E-102 Ī Ichi-Zero-Ni?), codename γ or Gamma (ガンマ Ganma?), is a fictional character in the Sonic the Hedgehog series. He was the second E-100 Series battle robot created by Dr. Eggman[1] during the Chaos incident, but later gained his own sentience when he learned of friendship from Amy Rose and turned on his creator. He then assumed his own mission to "free" his robot brethren from Eggman, and succeeded, though at the cost of his own life.

Concept and creation

Various concepts alongside E-102 Gamma's final design.

Concept artwork of Gamma shows his most obvious basis is the Eggrobo from Sonic & Knuckles, though he also bears resemblance to many renowned battle robots in science fiction, particularly ED-209, a law enforcement droid from the RoboCop series.


Gamma, from Sonic Art Assets DVD.

E-102 Gamma was a humanoid robot colored in mainly red and white. He possessed no neck, his head and torso coming together in an almost ellipsoid shape. His torso was red with a wide and white vertical stripe down the middle, and possessed a head light with a hexagonal gray frame on the right side. He also had gray mufflers surrounding the pelvis area, and had the number "102" painted in white on the right of his large vertical stripe and the left side of his rear. His head meanwhile was small and platform-like with a yellow shade and green cylindrical eyes. He also had a hexagon-shaped disk hovering behind his neck, and a laser targeting scope on the right side of his head.

Gamma's shoulders were black vertical cylinders. Attached to each of them were Gamma's arms, which were long and designed with two joints; his left arm held Gamma's black-gray blaster while his right arm had a tri-digited hand with two points of articulation on each digit. Also, Gamma's right upper arm was red with yellow-orange cuffs, while the parts between his upper arms and forearms were gray. Gamma also possessed two long and inverted legs with five points of articulation and large, black feet with two sharp toes and roller wheels on the heels. The upper sections of his legs in particular were red while the rest of them were gray, except from his calves, which were thick and red with gray and yellow-orange cuffs.


Sonic Adventure

In Sonic Adventure, E-102 Gamma was created by Dr. Eggman as the second unit in the E-100 Series. Gamma in particular was powered by a captured pink bird held inside the robot. After his activation in Final Egg, he was ordered by Eggman to pass a shooting range in the base to test his efficiency. Following this task, Eggman, wanting a good crew for his Egg Carrier, made E-102 fight his older "brother", E-101 Beta. After defeating Beta in combat, his first task on board involved capturing a frog that had absorbed Chaos' tail and held a Chaos Emerald that Eggman desired. The mission also served as a contest against his other "brothers", Delta, Epsilon, and Zeta.

To complete his task, Gamma went to Emerald Coast from Station Square to find the frog, who was Big the Cat's best friend, Froggy. After locating Froggy and snatching him out of Big's hands, Gamma went back to the Egg Carrier, where he reunited with the other robots, who claimed to have the right frog. When Eggman came in, he was disappointed to see that his robots had failed at their mission, but was delighted when he saw Gamma with Froggy. After that, the doctor disposed of the other E-100 Series robots to remodel them in front of Gamma; this event would be recorded in Gamma's memory. Following this, Eggman made Gamma go to the prison cell of the Egg Carrier and get Birdie, a bird that was accompanied by Amy Rose. However, the robot accidentally entered another room where he stared at Beta being gruesomely remodeled by a machine, another event that would be saved in his memory. Though disturbed by this sight, he quickly disregarded this and returned to his mission. After finding Amy, E-102 strictly demanded her to give him Birdie, which she refused to do. After Gamma insisted, Amy proceeded by questioning him, and from this Gamma experienced illogicality in his programming due to a conflict of interests. He then asked her why she would risk her life to save something that was useless to her; Amy simply replied that he did not need to obey Eggman. After this, Birdie flew up to Gamma knowing that his pink relative was inside. After a long stare into Birdie's eyes, perhaps triggering memories from his organic battery, Gamma realized that he needed to release them; he then proceeded to do this. Surprised and touched by this, Amy exclaimed that Gamma must be different from the other robots and tells him she would be his friend.

Shortly after, Gamma was called by Eggman to kill Sonic and Tails at the deck of the Egg Carrier. A grueling battle ensued between Sonic and Gamma which ended when Amy intervened, begging them to stop and explaining to Sonic and Tails that Gamma was a friend. The two reluctantly submitted to Amy's pleads as Gamma backed down. As the Egg Carrier began to lose altitude and slowly fall to the earth below, Amy encouraged Gamma to free himself, explaining the virtues of friendship before they evacuated. While hovering to the Mystic Ruins, Gamma's life flashed before his eyes with pictures of Eggman, the other E-Series robots, Amy and the Egg Carrier, flashing faster and faster until he saw Amy one last time and realized his purpose. Gamma determined that Dr. Eggman was the enemy, and deleted his master registration program. He then decided to begin a "rescue" mission, locating the rest of the E-100 Series robots and freeing the Animals trapped inside them.

Gamma first found and destroyed Delta in Windy Valley, then he located Epsilon in Red Mountain on Angel Island, and eradicated him as well, freeing the Animals. Afterward, he ran a scan to locate Zeta; his results showed that Zeta was not in any range of the Mystic Ruins or Station Square. Gamma realized that he had to be aboard the Egg Carrier, so he returned to the ship to find him. After destroying the upgraded and much more heavily fortified version of Zeta, he overlooked his progress, trying to locate the final E-Series model, E-101 Beta, knowing that he had to be on or around the Egg Carrier. He overlooked himself as the other E-Series robot that had also be "saved". On the deck of the Egg Carrier, while thinking, Beta flew by the east side of the Egg Carrier as the newly rebuilt E-101 Mark II. Gamma quickly moved to the center of the ship where Beta was waiting for him for the final confrontation. Despite Beta's numerous enhancements, Gamma eventually succeeded in destroying Beta.

The pink bird inside Gamma flying away with its sibling, from Sonic Adventure.

Before exploding, however, Beta gathered up one last ounce of strength and suddenly blasted Gamma at point-blank range, severely damaging him. As Gamma limped away from the battlefield, the bird that was inside Beta flew up close and stirred one final memory in Gamma, of a family of birds together. Gamma, realizing he needed to free his bird, didn't activate his auto repair system. He then collapsed and self-destructed, freeing the pink bird inside, who united with the other bird, a family member whom it had been separated from. After that, the birds reunited with Amy's blue bird companion to become a family. The pink bird later followed Amy to Station Square after it was near destroyed by Perfect Chaos. While Gamma himself could not be there, the bird represented him in spirit.

Despite Gamma's betrayal of Eggman, the doctor continued to build robots based on the E-102 model after Gamma's demise, most likely because Eggman never found out about Gamma's betrayal.

Other game appearances

Sonic Shuffle

Gamma is one of the secret characters in Sonic Shuffle, where the game's description says he returned "by the strange power of the dreams of Maginaryworld."[2] Like all players he holds a unique playing ability. If he plays a 4, 5, or 6 cards, he will change into wheel mode which will negate the effects of minus ring spaces. If he plays a special card during a battle, two roulette's will spin, and the sum of the two numbers will equal the damage done to an enemy. Gamma is unlocked after obtaining the final image in Amy's room.

Sonic Heroes

In Sonic Heroes, Gamma is mentioned whenever Omega gets an E-Rank, where he expresses his own "inferiority" compared to Gamma and Beta.

Sonic Rivals

In Sonic Rivals, Gamma makes an appearance as the 135th collectible card in the game.

Super Smash Bros. series

Super Smash Bros. Brawl

In Super Smash Bros. Brawl, Gamma appears as a Sticker:

Image Name Page ID Area of Effect Effect User
Brawl Sticker E-102 Gamma (Sonic Adventure Director's Cut).png
E-102 Gamma (Sonic Adventure Director's Cut) 275 687 Flame Attack +11 Everyone

Super Smash Bros. Ultimate

In Super Smash Bros. Ultimate, Gamma appears as a Primary Spirit with the following characteristics:

Image Stat statistics Spirit Battle
Base Max Enemy Fighter(s) Enemy Power Stage Battle conditions
E102gamma.png Power: 953
Attack: 453
Defense: 500
Power: 4,768
Attack: 2,265
Defense: 2,503
R.O.B. (120 HP) 1,700 Frigate Orpheon Rule(s): N/A
  • Stamina battle
  • The enemy's shooting items have increased power
  • The enemy starts the battle with a Ray Gun
Name Type Class Music Acquisition
Gamma Grab ★ (Novice) "Open Your Heart"
  • Battle via Spirit Board
  • Purchase from the Vault Shop for 500G
No. Slots Ability
784 1 N/A

Sonic & All-Stars Racing Transformed

In Sonic & All-Stars Racing Transformed, Gamma appears as an icon on the game's "Blast Processing" Sticker.

Sonic Forces: Speed Battle

In Sonic Forces: Speed Battle, Gamma is set to become a playable character in July 2022.


E-102 Gamma is renowned for gaining his sentience. Even under evil alignment, however, he held a sensible and rational manner towards his enemies. However, he became somewhat uncomfortable to vivid human emotions, to the point that the emotional conflict of his loyalty pains him, leading to his eventual leave of duty. It should be noted that even when gaining a free will, Gamma still held a rather regimented attitude and devotion to his mission. He considered his life less important than his friends' and was shown to fight selflessly for them to the brink of sacrificing himself.

Powers and abilities

As one of Eggman's destructive gunner robots, E-102 is designed for battle. His main weapon is a machine gun that can internally transform into a 15.5 cm missile launcher that can fire Homing Missiles in rapid succession after locking on with a laser targeting device on his head. Due to the targeting device, E-102's shots are always accurate and allows the pinpoint accuracy to find an enemy's weak spot (as opposed to Omega, who simply shoots in all directions, hoping something will hit). In addition to his missile launcher, E-102 has a variety of modes to change his body frame to suit a situation. He features a normal, upright position when he is walking or moderately running; in a hurry, he crouches down so he can roll on a set of wheels behind his feet to increase his speed, and when he encounters water or another insufficient place to walk, his feet fold in and a rotor appears from his torso, allowing him to float over the obstacle indefinitely and to fly in the air like in the cutscene where he left the Egg Carrier after Tails and Amy left it. He also has a headlight attached to his torso, but it is never actually used in-game.

Eggman also installed Gamma with the ability to accept Level Up Items into his system. The Level Up Item Laser Blaster upgraded Gamma's weapon and allowed him to lock-on to an increased number of enemies and deal extensive damage. The Jet Booster permitted Gamma the ability to hover for some time and cross longer distances in the air.


Dr. Eggman

As his creator and the first person he saw upon activation, Gamma exhibited a strong sense of loyalty and devotion towards Dr. Eggman. Because of his programming, Gamma originally obeyed Eggman every time and did his missions without questions. However, after a series of events, Gamma turned on against Eggman without the doctor's consent, having considered him to be an "enemy", and removed any data that made him obedient to the doctor in his programming.

Amy Rose

Amy Rose formed a large bond with Gamma that greatly defined his fate. The two first met at the prison cell of the Egg Carrier, where Gamma tried to convince Amy to give him Birdie, though with no success. After having a closer look of Birdie, however, E-102 liberated her from her cell, telling her to go away, much to her surprise. The two later met when Gamma was fighting Sonic, a battle Amy stopped. After this event, Amy told Gamma to abandon Eggman. Following the fall of the Egg Carrier, Gamma followed Amy's advice and turned on against his master.






E-1000 was a mass-produced robot model deployed by Dr. Eggman during the Space Colony ARK incident. However, the E-1000 robots were far less armed, armored, and sentient compared to Gamma.

Chaos Gamma

Main article: Chaos Gamma

Chaos Gamma, from Sonic Battle.

E-102 Gamma, also known as Chaos Gamma, was a successor of Gamma created by Dr. Eggman during the Emerl incident. Compared to the original Gamma, Chaos Gamma possessed several more weapons, such as a grenade launcher and an electric dagger. During the Emerl incident, Chaos Gamma made numerous attempts to capture Emerl for his master and held a Chaos Emerald shard in its body at one point in an attempt to strengthen it.

In other media

Books and comics

Archie Comics

Gamma, from Sonic Universe #3.

In the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics, Gamma was the second unit in the E-100 Series robotic group created by Dr. Eggman. Gamma was one of the first E-100 Series robots created during Eggman's campaign to harness the power of Chaos. Due to an encounter with Amy Rose and her Flicky friend however, Gamma gained a consciousness. Gamma then went rouge and waged war on the Eggman Empire. After over a year spent fighting alone, Gamma was offered to join Guardian Units of the Nation, but was hunted down and destroyed by E-123 Omega. However, he managed to upload his "free will" code into Omega's programming to continue his dream.

After the Super Genesis Wave re-wrote history, Gamma became virtually indistinguishable from his video game counterpart.


Sonic X

Main article: E-102 Gamma (Sonic X)

E-102 Gamma, from "Pure Chaos".

In Sonic X, Gamma was the second robot of the E-100 Series line created by Dr. Eggman in an attempt to harness Chaos' energy to destroy Station Square. Like his video game counterpart, Gamma turned against his master following an encounter with Amy and Lily, and began a mission to hack his brothers' systems to make them turn against the doctor too. However, this did not work on Beta, who attacked Gamma. After trying to reason with him, with little success, Gamma clashed with him, fatally damaging them both and "freeing" their animal batteries. As they collapsed and exploded, their hands grasped each other's, as a touching final symbol of their unity. During this event, Amy saw the two being destroyed and cried, as the birds inside of the robots were freed and acknowledged as siblings, echoing the relationship between Gamma and Beta.


  • E-102's full name can be converted into a mathematical formula (e - (102 * Euler-Mascheroni Constant)) which equals -56.1577159915.
  • Gamma is the only playable character in Sonic Adventure to have a theme without lyrics.
  • Unless Gamma manages to hit a wall corner and glitch downward, he cannot take a step into any water environments. Attempting to do so will automatically transform him into his hover mode until he is moved to dry land, and he will instantly change into his wheeled mode upon landing.
  • The physics of Gamma's Mode Changes change should he be holding something when he transforms. If he changes into his wheeled mode while carrying an item, he will not announce the change, and he will transform back into his default mode upon stopping. Should he change into his helicopter mode while carrying an item, his physics change to become more floating, and he can overcome barriers his normal helicopter mode cannot.
  • An odd effect takes place in Gamma's Adventure Mode in Sonic Adventure upon completing his story, creating a consistent night-time effect in the Adventure Fields. This also happens in Sonic Adventure DX: Director's Cut, but resets upon entering Mission Mode.
  • Gamma is the only playable character in Sonic Adventure not to appear in the end story of that game, although the pink bird that powered him is present.
  • Gamma is the only playable character who never encountered Chaos in Sonic Adventure.
  • Gamma is one of only two characters to have Sonic Channel artwork identical to their first render, the other being E-123 Omega.
    • Coincidentally, both characters are robots who were created by Dr. Eggman and then turned against him.
  • Gamma is the only playable character who did not receive an updated model with a higher polycount in Sonic Adventure DX: Director's Cut, nor did he receive updated textures.
  • In the original Japanese release for Dreamcast, Gamma was a completely silent character during gameplay, only speaking in cutscenes and during his rival battle. This was changed in the International release and all subsequent versions.
  • Gamma's phrase "Resistance is futile!" is a reference to the Borg from Star Trek.
  • Gamma was originally intended to be in Sonic Heroes in a team with Big and Chaos.[3] This is likely why Chaos and Gamma were in Sonic Battle, over Omega or the Chaotix. It was mentioned that even though Gamma died in Sonic Adventure, his shell still remained and his inner part could have been replaced.[4]


  1. 1.0 1.1 1.2 Sonic Channel (Japanese). Characters: Gamma. Sega. Archived from the original on 26 May 2019. Retrieved on 3 July 2015.
  2. Sonic's Gallery, photo 37: "Gamma is back, by the strange power of the dreams of Maginaryworld."
  3. Shiro Maekawa (@mizuhano) on Twitter (Japanese). Twitter (26 April 2018).
  4. Shiro Maekawa (@mizuhano) on Twitter (Japanese). Twitter (26 April 2018).