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First appearance

Sonic Adventure

in other media

Sonic X

Biographical overview

Dr. Eggman


Egg Carrier

Also known as
  • Dr. Eggman's Guard Robot
  • Tin Can
  • Bolt Brain (by Amy, once)
  • Chunk of cheesy hardware (by Sonic once)
Physical description


Color scheme




Skills, abilities and powers

Chasing and recovering, can create sound waves

ZERO, also known as E-100α[1] or E-100 Alpha (E-100 “アルファ”?)[2], is a large, red-eyed, floating green robot that resembles a trash can with large arms that tries to recover Chaos Emeralds. He appeared in Sonic Adventure as the antagonist of Amy Rose's story.


Although it is not called an E-Series robot in the games or Sonic X, it was given a similar codename on the Sonic Adventure website accessed via Dreamcast. Unlike the E-100 Series robots, it does not have "E-100" on its body, but instead it has "E" on both sides of its body. Also, the headlight on ZERO is on its shoulder, in contrast to the E-100 Series robots in which it is on their mid-section. ZERO is also not powered by an animal like its immediate successors, as nothing is seen escaping from its body after its destruction.

ZERO differed greatly from the other E-100 robots as it lacked a projectile weapon of any sort, mainly relying on its extending fists to attack its foes. It also possessed impressive strength, able to smash through walls in pursuit of Amy. It also had strong defensive strength, as Amy could only inflict damage by electrocuting it. It pursues its target with a single-minded tenacity, even after the Flicky's Chaos Emerald had been removed. This also made it possible to trick it, as Amy could hide beneath barrels or around obstacles to elude it. It also seems to possess an "overdrive" mode after taking a certain amount of damage, where steam begins bellowing from its smokestack-like head and its aggression will increase, rendering it invulnerable to any sort of attack.


In Sonic Adventure, ZERO made its debut by chasing a blue Flicky in the possession of a Chaos Emerald that has taken refuge with Amy Rose. ZERO chased Amy around Station Square, Twinkle Park, the Egg Carrier, Hot Shelter, and finally, the Final Egg base in the Mystic Ruins.

When it went back to the Egg Carrier, it saw Amy and the Flicky with the bird's relatives, who were inside E-101 Beta and E-102 Gamma. ZERO then attacked and knocked out the small Flicky with an extending punch. Amy, thinking that ZERO had killed her companion, became furious and attacked ZERO - finally destroying it by knocking it into an electric fence, scrambling its circuits, before smashing the vulnerable circuitry in its head with her hammer, causing him to explode.

Other Game Appearances

Sonic Advance 2

ZERO makes a brief appearance in Sonic Advance 2, chasing the player around the Special Stages of the game. In this appearance, it is known as the Robot Guard (ガードロボ lit. "Guard Robo"?), but otherwise looks identical to its previous appearance. If it hits the player, they lose ten rings.

Sonic Rivals 2

ZERO appeared in Sonic Rivals 2 as collectible card No. 81. It was unlocked by obtaining the high score in Zone 6 Act 3.

Sonic X

Main article: ZERO (Sonic X)

ZERO also appeared in the anime series Sonic X, in the Chaos Saga. His role in the series mirrors to that in Sonic Adventure.



  • Alpha is the first letter of the Greek alphabet. Zero (AKA Alpha) is said to technically be the direct predecessor of the E-100 Series robots.
  • The first letter of the Greek alphabet is sequenced as 0. Perhaps that is why ZERO is occasionally known as Alpha.
  • Despite its name in supplemental sources, Eggman apparently does not consider ZERO to be a part of the E-100 Series, as he calls E-102 Gamma his second model.
    • The reason for this may be that ZERO is the last of the pre E-100 Series robots.
  • ZERO, E-105 Zeta (the second form), E-121 Phi and E-123 Omega are the only earlier E-Series robots that do not follow the same basic design as E-101 Beta.
  • As a villain, ZERO has traits common to the Strong Silent Types of "slasher" movies in that it is big, slow, strong, and cannot be hurt or killed under normal circumstances.
  • In the early Japanese Sonic Adventure website, ZERO is also dubbed the Prototype of the "Eggrobo" E-Series (エッグロボEシリーズの試作機?). It is uncertain if this is supposed to be meaning behind the "E" in E-Series, if it was actually intended to be a throwback to Eggrobo, or if this was outdated information by the game's final release.
  • ZERO is sometimes known among fans as "The Chase Master" due to the name of its song on the soundtrack.


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