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E-101 Beta, more commonly known as E-101 ONE​, is the second robot in the E-100 Series of Sonic Adventure, after E-100 Alpha. He only appears in the story of his successor, E-102 Gamma.

Sonic Adventure

E-101 Beta Mark I appears after Gamma's functions are tested, and he proves that he is working properly. Dr. Eggman decides to have the two robots duel, because of lack of space on the Egg Carrier. Beta is bested by his "younger brother", and Eggman decides to reconstruct Beta. Gamma later discovers Beta while he's being reconstructed and is horrified, and this ultimately is a factor in Gamma's rebellion against Eggman.

Beta himself doesn't return until the very end of Gamma's story. Fully reconstructed, E-101 Beta Mark II flies from the insides of the crashed Egg Carrier and begins to fight E-102. After a heated battle, Beta blasts Gamma, with both of them exploding, releasing their Flicky power sources, which are family members.

Trivia

  • Of the E-100 Series robots seen onscreen (Alpha, Beta, Gamma, Delta, Epsilon, Zeta, and Omega), Beta is one of the only two who doesn't speak, the other being Alpha. Delta, Epsilon, and Zeta each have one line when presenting the wrong frogs to Eggman.
           Sonic Villains

Eggman Empire
Dr. Eggman | Orbot | Cubot | Metal Sonic | Mecha Sonic | Silver Sonic | Mecha Knuckles | Metal Knuckles | King Boom Boo | Badniks | Tails Doll | E-100 Alpha | E-101 Beta | E-104 Epsilon | EggRobo | Eggman Enterprises | MeteorTech | SCR-HD | Master Core: ABIS | Time Eater | Infinite

Team Dark
Shadow the Hedgehog | Rouge the Bat | E-123 Omega

Babylon Rogues
Jet the Hawk | Wave the Swallow

Eggman Nega's Forces
Eggman Nega | Metal Sonic 3.0

Deadly Six
Zavok | Zazz | Zeena | Master Zik | Zomom | Zor

Black Arms
Black Doom | Devil Doom

Nocturnus Tribe
Imperator Ix

Team Hooligan
Fang the Sniper | Bean the Dynamite | Bark the Polarbear

Other
Babylon Guardian | Bearenger the Bear | Biolizard | Black Knight | Captain Whisker | Carrotia the Rabbit | Chaos | Dark Gaia | Dark Gaia's Minions | Dr. Fukurokov | Erazor Djinn | Fockewulf the Wolf | Iblis | Mephiles the Dark | Merlina | Scorpius | Shade | Sir Lancelot | Solaris | Wendy Witchcart

           DEATH BATTLE Villains

DEATH BATTLE Combatants
Boba Fett | Shang Tsung | Akuma | Zangief | Goomba | Koopa | Riptor | Kratos | Shadow the Hedgehog | Vegeta | Starscream | Dr. Eggman | Eggman Empire | Badniks | Silver Sonic | Mecha Sonic | Mecha Knuckles | E-101 Beta | Shadow Androids | Scratch | Grounder | Metal Sonic | Dr. Wily | Yellow Devil | Guts Man | Metal Man | Slash Man | Magnet Man | Sheep Man | Napalm Man | Pharaoh Man | Bass | Treble | M. Bison | Shao Kahn | Ivy Valentine | The Terminator | Sektor | Fulgore | Gamera | Godzilla | Ryu | Scorpion | Deathstroke | Deadpool | Majin Buu/Kid Buu | Gaara | Segata Sanshiro | Nightmare/Inferno/Soul Edge | Lex Luthor | Black Beast | Darth Vader | Doctor Doom | Donkey Kong | Trish | Jeanne | Bowser | Ganondorf/Ganon | Quicksilver | Sweet Tooth | The Joker | Mewtwo | The Meta | Scout | Doomsday | Bane | Venom | Android 18 | Balrog | Silver Samurai | Shredder | Sephiroth | Vergil

DBX Combatants
Trish | Jeanne | Jango Fett | King Dedede | Sasuke Uchiha | Hiei | Liu Kang | Alucard | Predator | Meta Knight | Broly | Doomsday | Akuma | Magneto | Darth Vader | Vegeta | Zod | Demitri Maximoff | Kratos |

Other
Wizard & Boomstick | Possessed Super Saiyan God Goku Pop Vinyl Figure | Sarge