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E-101 Beta

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E-101 Beta
E-101 Beta
First appearance

Sonic Adventure

in other media
Biographical overview

Unknown (deceased)


Dr. Eggman

Physical description



None (referred to as male)


200 cm (6' 6")


1024.256 kg

Color scheme

Silver, black, white



Alignment and character traits



Eggman Empire

Powers and abilities
  • Hovering
  • Missile generation
  • Mode switching

E-101 Beta (E-101 "ベータ" E - 101 "bēta"?), or E101β, is a character that appears in Sonic Adventure and Sonic Adventure DX: Director's Cut. He was the first animal-powered E-100 Series robot created by Dr. Eggman. Initially intended to serve onboard the Egg Carrier, Beta lost the position to his "younger brother" E-102 Gamma. As such, he was discarded by Eggman and upgraded into E-101 Mark II.


E-101 Beta was created by Dr. Eggman as the first of the doctor's E-100 Series robots, with a grey-feathered Flicky bird serving as his power source. While Beta went to the Final Egg shooting range to practice, Eggman finished constructing Beta's "younger brother", E-102 Gamma.

Shortly after Gamma's test-run, Beta was summoned by Eggman and was pitted against Gamma to decide which of them would get a position among the crew onboard Dr. Eggman's Egg Carrier. Despite having the odds in his favor, Beta was defeated by Gamma. Not beaten in spirit though, Beta mutely appealed to his creator to still come along. Interested, Eggman eventually allowed Beta the privilege on the grounds that they could "always use a spare set of parts."


Beta being rebuilt into E-101 Mark II.

Having been regarded obsolete, Beta was relegated to an Egg Carrier robotics lab. There, Beta underwent a torturous remodeling operation into the more powerful E-101 Mark II where he was physically dismembered and his old limbs were discarded on the floor while mechanical arms worked on him. In the midst of this process, Gamma stumbled into the lab and saw the operations on Beta. This horrible sight served as the breaking point for Gamma that set him on the road to apostasy, eventually making him betray Dr. Eggman and delete him from his master registration.

Eventually, E-101 Mark II was finished and escaped from the Egg Carrier, but was quickly confronted by Gamma, as a part of the former's fratricidal crusade to "rescue" his brothers from Eggman's control by destroying them. E-101 Mark II was destroyed, but not before fatally wounding Gamma as well.

Powers and abilities

Being a model in Dr. Eggman's E-100 series, Beta was built for combat. According to Dr. Eggman, Beta was even more advanced and powerful than E-102 Gamma was.[1][2]

Beta was equipped with small twin cannons fitted to each arm that could fire powerful missiles. He also possessed a Jet Booster that enabled him to slowly hover through the air for a safe landing. Additionally, as shown by his design, Beta could change his body frame when crouching down which let him roll on a set of wheels behind his feet to increase his speed.


Boss guide

E-101 Beta is a moderately tough foe, but you can target and fire faster than it can. Target E-101's missiles, as well as the robot itself. Keep your distance and use your speed to your advantage.


Sonic Adventure DX - Gamma Boss 1 - E101 Beta (no damage) 1080p02:31

Sonic Adventure DX - Gamma Boss 1 - E101 Beta (no damage) 1080p

Apperances in other media

Sonic X

Main article: E-101 Beta (Sonic X)

E-101 Beta appears in Sonic X. During the Chaos Saga of the show, Beta mirrored several key points in its original story line and also gained more scenes by taking most of E-105 Zeta's role from the game.

One of these key features that was not present in Sonic Adventure is Beta's ability to speak. Like ZERO in Sonic Adventure, E-101 was also unable to, or was at least not shown to speak, and could only respond by "Body Language"- in its case, interrupting Eggman and giving signals via movement and its blank facial expression. Beta also goes out to find Froggy along with the other E-Series robots, something which originally Zeta had done; in the game, Beta was already undergoing its modification process.

Like the other E-Series in Sonic X, Beta's new voice was very high-pitched and, according to fans, unenthusiastic, as opposed to in Sonic Adventure where the robots spoke in a manner that while still being slightly robotic, was very intelligent and much more human than drone-like.


  • Beta and Gamma are mentioned in Sonic Heroes; when Team Dark gets an E Rank, E-123 Omega would occasionally say "I couldn't even beat Gamma or Beta."
  • Beta is the only E-series robot to lack yellow cuffs on his limbs, featuring uniform silver cuffs throughout his entire design.
  • It is assumed that Beta's discarded Missile Launcher arms were used on Delta, as Delta became identical to Beta's original configuration after being jettisoned from the Egg Carrier.
  • Beta is one of two E-Series robots in Sonic Adventure to receive a physical Level Up Item (the other being Zeta). The remaining E-Series, including Gamma, only received enhanced Arm Cannons (and a Jet Booster).
  • Strangely, in the ending shots found in the credits of Gamma's story mode, any time Beta is seen he does not feature his jet booster or twin arm cannons, appearing as a black version of E-102 disregarding his specific numbering and lack of targeting sight.
  • When found in the middle of his reconstruction, Gamma looks down and sees Beta's discarded parts on the ground, oddly including Gamma's missile launcher despite Beta having twin arm cannons.


  1. Sonic Team, Sonic Team USA (June 27, 2003). Sonic Adventure. GameCube. Sega. Level/area: Egg Carrier Adventure Field. "Eggman: "Enter, Gamma! You are not as advanced as Beta is, but you'll do fine"
  2. Sonic Team, Sonic Team USA (June 27, 2003). Sonic Adventure. GameCube. Sega. Level/area: Egg Carrier Adventure Field. "Eggman: "I am pitting the two of you against each other, and the winner serves on my ship. I put my bets on Beta, but I owe you at least a fair chance."

Sonic Adventure

Main article | Gallery | Beta Elements | Re-releases (DX | 2010)

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