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Sonic Wiki Zone
Sonic Wiki Zone
"E-100" and "ZERO" redirect here. You may be looking for the E-100 Series. Not to be confused with Zero.

After days of relentless chasing, it’s finally time to confront the nightmare.

— Description, Sonic the Hedgehog Encyclo-speed-ia

E-100,[4] codenamed α[4] (アルファ[5][6] Arufa?) or ZERO,[5][7][8] is an antagonist of the Sonic the Hedgehog series. It was the prototype model for Dr. Eggman's E-100 Series, designating it as the zeroth E-100 unit, while E-101 Beta is designated as the first unit and E-102 Gamma is the second unit.[5][6] During its last mission to recover one of the Chaos Emeralds, ZERO relentlessly pursued Amy Rose for the Emerald she unknowingly had until it had harassed her to the point of being on the receiving end of Amy's Piko Piko Hammer.



E-100 ZERO, from Sonic Adventure.

ZERO was a vaguely humanoid green robot with a trashcan-like head. On top of its head was a lid with a black surface and yellow lower rim, and on the bottom of its head was a red stripe. Situated on the bottom of its head up front was a black face section with two red eyes, and extending out in front of ZERO's face was a golden handlebar. On the back of its head were also two green prongs with red tips. On the sides of its head, next to its face, it also had two black bars for shoulders. Attached to these bars were its arms, which had thick green and red forearm armor and mitten-like black hands. Its lower body consisted of two stubby rocket thrusters attached on the sides of its hips. These thrusters were red on the top and had black exhausts on the bottom. It also had a fin on its rear, and up front it had a gray flap covering its pelvis. This pelvis plate had a black upper and lower rim, and a golden handlebar with a black grip attached to its bottom.

Unlike the other E-100 Series robots, ZERO did not have "E-100" on its body, but instead had an "E" on both sides of its head. Additionally, the headlight on ZERO was on its shoulder, in contrast to the E-100 Series robots in which it is on their mid-section.


Sonic Adventure[]

In Sonic Adventure, its enhanced port Sonic Adventure DX: Director's Cut and the 2010 remaster, ZERO was given the task of chasing Birdie, a blue bird in the possession of a Chaos Emerald that had taken refuge with Amy Rose. As such, ZERO chased Amy around areas of Station Square, the Egg Carrier, and the Mystic Ruins.

Eventually, ZERO went back to the Egg Carrier. There, it saw Amy and Birdie with the latter's relatives, who were inside E-101 Beta and E-102 Gamma. ZERO then attacked and knocked out the small bird with an extending punch. Amy, thinking that ZERO had killed her companion, became furious and attacked it - 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 it to explode.

Sonic Advance 2[]

In Sonic Advance 2, ZERO chases the player around the Special Stages of the game. In this appearance, it is known as the Robot Guard (ガードロボ Gādo Robo?, lit. "Guard Robo") or Zero,[8] but otherwise looks identical to its previous appearance. If it hits the player, they will lose ten Rings. Also, if the player has no Rings, then touching it again will result in the playable character being booted from the Special Stage.

Sonic Rivals 2[]

In Sonic Rivals 2, ZERO appears on a collectible card:

Image Card Number Card Challenge Unlocked
Sonic Rivals 2 - Card Collection 81 81 ZERO Get the High Score in Zone 6 Act 3 Zone 6 Chao Detector


ZERO pursued its target with a single-minded tenacity, even after Birdie's Chaos Emerald had been removed. It was also smart enough to try and use sneak attacks on Amy after their first encounter, and to never reveal the weak spot hidden under its top intentionally. When pushed to the brink, however, it became much more aggressive.

Powers and abilities[]

As part of the E-Series, ZERO was a very advanced robot that was developed to advance weaponry.[9] However, it differed greatly from the other E-100 Series robots as it lacked a projectile weapon, mainly relying on locking onto an opponent and launching its fists to attack its foes, making use of a lock-on system and tethered hands. Unlike the standard E-Series model, ZERO also lacked legs or a Jet Booster, instead relying on a built-in propulsion unit for locomotion, which helped it to move over all possible terrain. It possessed impressive strength, able to smash through walls in pursuit of Amy and generate shockwaves by punching the ground. It also had strong defensive strength, as Amy could only inflict damage by electrocuting it. It seemed to possess an "overdrive" mode as well after taking a certain amount of damage, where steam began bellowing from its smokestack-like head, rendering it invulnerable to any sort of blow from the Piko Piko Hammer.





ZERO is the first and only boss of Amy's storyline in Sonic Adventure, its enhanced port Sonic Adventure DX: Director's Cut and the 2010 remaster. In Adventure Mode, it is fought when the player approaches the dock of the Egg Carrier at Amy's story. In Trial mode, it is the only boss in the Boss Sub Game as Amy.

Boss guide[]

The fight's strategy is to knock ZERO into the electric ropes that encircle the arena. When Amy swats ZERO into the hot wires, its body gets an unhealthy jolt, and the top of its green head flips back to reveal a big, blue core. The player must attack this core to deal damage to ZERO, who will then flip back its green top to cover its weak spot.

Arm Punch, the move seen during the Action Stages, is used by ZERO during this battle by first locking onto Amy and then shooting its hands towards her. ZERO also performs the Earthquake Attack. To avoid it, the player has to keep a certain distance between ZERO and Amy to hop over the shockwaves produced. When ZERO is almost finished, it sends an Electric Arm after Amy, which she must skip over to survive. The player must run in the same direction that the rope is turning and jump to avoid it. After landing three hits on its core, ZERO finally explodes, and the player will have cleared Amy's storyline.


Name Artist(s) Length Music track
"ZERO The Chase-master ...Boss: Eggman Robot -ZERO-" Jun Senoue 1:58


In other media[]

Sonic X[]

Main article: ZERO (Sonic X)
ZERO Sonic X ep 28

ZERO, from "A Chaotic Day".

In the Sonic X anime series, ZERO was the prototype of Dr. Eggman's E-100 Series. In this media, it was given the task of capturing Lily, a little bird that had a Chaos Emerald, for Eggman. However, Amy Rose eventually stood in ZERO's way and protected Lily from it, later on destroying the robot.

Archie Comics[]

In the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics, ZERO was not one, but a mass-produced model of the E-100 Series that was created by Dr. Eggman after receiving a new robot body. In this media, two ZEROs were tasked with capturing Birdy for Eggman but failed. Sometime later, the ZEROs were decommissioned by the doctor and scrapped.

After the Super Genesis Wave re-wrote history, ZERO's past became virtually undistinguishable from that of its game counterpart.


  • Unlike most of the other E-100 Series robots, ZERO was not powered by Animals.[10]
  • On the early Japanese Sonic Adventure website, ZERO is dubbed the "Prototype of the Eggrobo E-Series" (エッグロボEシリーズの試作機?).[4] 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. It should be noted, though, that the term "Eggrobo E-Series" was later used in ZERO's profile in Sonic Adventure: Navigation Guide.[10]







  1. Sonic Team . Sonic Adventure Online. Amy Rose tactical info: ZERO Attack Patterns. Archived from the original on 31 May 2016.
  2. Sonic Team . Sonic Adventure Online. Amy Rose tactical info: ZERO Attack Patterns. Archived from the original on 31 May 2016.
  3. Sonic Team . Sonic Adventure Online. Amy Rose tactical info: ZERO Attack Patterns. Archived from the original on 31 May 2016.
  4. 4.0 4.1 4.2 ZERO攻略ヒント 1/3 (Japanese). Archived from the original on 26 February 2003.
  5. 5.0 5.1 5.2 "E-102 "γ"" (in Japanese). ソニックアドベンチャー オペレーションガイド. SoftBank. January 1999. p. 114. ISBN 978-4757203006. "Dr.エッグマンが作った射撃用ロボ、E-100シリーズの2番機。 Dr.エッグマンのメカは基本的に、生体エネルギーを抽出するため小動物をその中枢に据えているが、E-102も例外ではない。 ちなみに一番機が「ベータ」、二番機が「ガンマ」と称されるのは、プロトタイプの0番機「アルファ」が存在するため。 劇中では語られていないが、エミー追撃の任に当たった「ZERO」がそれである。[The second of the E-100 Series of shooting robots made by Dr. Eggman. Dr. Eggman's mechs basically put small animals at the center of them to extract bioenergy, and E-102 is no exception. By the way, the first machine is called 'Beta' and the second machine is called 'Gamma' because the prototype zeroth machine 'Alpha' exists. Although it is not mentioned in the play, it is 'ZERO', who was in charge of pursuing Amy.]"
  6. 6.0 6.1 Sonic Channel (Japanese). Characters: Gamma. Sega. Archived from the original on 26 May 2019. Retrieved on 3 July 2015.
  7. Flynn, Ian; Sega (8 December 2021). "Sonic Adventure". Sonic the Hedgehog Encyclo-speed-ia. Dark Horse Books. p. 103. ISBN 978-1506719276. "E-100 ZERO - After days of relentless chasing, it's finally time to confront the nightmare."
  8. 8.0 8.1 Flynn, Ian; Sega (8 December 2021). "Sonic Advance 2". Sonic the Hedgehog Encyclo-speed-ia. Dark Horse Books. p. 126. ISBN 978-1506719276. "This combo disappears if you take too long or get ambushed by Zero. Zero will knock ten Rings from your counter, or if you're out of Rings, end the fun entirely."
  9. Eitaro Toyoda (2017). "Dr. Eggman in... My Greatest Invention". Sonic the Hedgehog: Rival Edition. Tomy.
  10. 10.0 10.1 "AMY" (in Japanese). ソニックアドベンチャー オペレーションガイド. SoftBank. January 1999. p. 113. ISBN 978-4757203006.

External links[]

  • ZERO at Sonic Adventure Online

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