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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

Skills, abilities and powers
  • Missile generation
  • Advanced tracking system
  • Hovering

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 one of the first E-100 Series robots created by Dr. Eggman and was meant to serve onboard the Egg Carrier as one of its crewmembers. However, when Beta lost to his "younger brother" E-102 Gamma in combat, he was discarded by Eggman and upgraded to E-101 Mark II, only to be destroyed by Gamma shortly after.


Dr. Eggman defined Beta as E-102 Gamma's "big brother", and decided to pit Beta and Gamma against each other to determine which robot would be fit to serve under him on the Egg Carrier. Gamma ultimately went on to defeat Beta in combat, earning his right to serve aboard the ship, and his design was replicated for the remaining E-100 Models - Delta, Epsilon and Zeta.

After convincing the Doctor to let it stay aboard the Egg Carrier as well, the obsolete Beta was relegated to the storage area to be used as "spare parts". Unhappy with its flawed design, Dr. Eggman began work on completely remodeling it into E-101 Mark II. The parts left over from Beta's remodeling, including its Jet Booster and Missile Launchers, were apparently used on E-103 Delta.


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

Appearances 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. Additionally, Beta was a silent character in the game.

As a Flicky


Gamma and Beta's Flickies.

When E101mkII is destroyed, a gray Flicky with red eyes emerges from the robotic armor sealing him inside. After Gamma's story, he flies off with Gamma's Flicky. He also appeared in Amy Rose's story in Birdie's pendant showing Gamma and Beta's Flickies.


  • 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."
  • It is assumed that Beta's discarded Missile Launcher arms were used on Delta.
  • Beta is one of two E-Series robots in Sonic Adventure to receive a physical upgrade (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.

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