From Sonic Retro

ZERO SAdvance2.PNG
First seen: Sonic Adventure (1999)
Species: Eggman robot (E-100 Series)
Gender: N/A

ZERO, known very occasionally as E-100 Alpha[1], is a villainous Eggman robot which debuted in Sonic Adventure. Possibly some sort of prototype for the E-100 Series, ZERO is a large green and black robot with red eyes that vaguely resembles a trash can with arms.


In Sonic Adventure, ZERO functions as the principal foil in Amy Rose's story. The robot spends the game chasing a blue bird named Birdie (known as Lily in Sonic X) who had taken refuge with the pink hedgehog. ZERO chases Amy around Station Square, finally catching up in Twinkle Park. After being imprisoned in the Egg Carrier, Amy escapes with help from E-102 Gamma and wanders into the Hot Shelter, where ZERO found her and started chasing her again. The robot functions not just as a plot device, but also as a persistent threat within Action Stages themselves, following Amy around each of her levels, and more often than not is Amy required to avoid it by using stealth or simply running away. She can attack ZERO to push it back, but hitting it too many times will make it enter an "overdrive" mode which makes Amy's attacks ineffective.

ZERO is unequivocally destroyed by Amy in the boss battle at the end of her story. Despite this, and perhaps as testament to the crazed, psychedelic rules that hold sway in the Special Zone, the robot reappears in Sonic Advance 2 as the guardian of that game's Special Stages. Here, ZERO is known simply as "Dr. Eggman's Guard Robot".Media:SonicAdvance2 GBA US manual.pdf[2]

Boss Fight - "ZERO"

Game: Sonic Adventure
Level: Egg Carrier (Sonic Adventure)
Hits to defeat: 3
Fought by: Amy

Amy and Birdie return to the splashed-down Egg Carrier after Final Egg, in an effort to locate the bird's missing family members. Much to everyone's delight, they are successful - Amy arrives just after Gamma's mutually destructive battle against E-101β mkII, and the freed birds can all join up. However, just as avian reunions begin, Birdie is punched out of the sky by ZERO's extend-o-fist! Amy's had enough of running away, and readies her Piko Piko Hammer for combat.

ZERO chases Amy around the Egg Carrier's main deck, targeting her with missiles and extensible fists which you must sprint to outrun. The robot is impervious to direct damage from Hammer Attacks; Amy has to take the pro-wrestling route and knock him into the ropes at the edge of the ring. The electric fence pops ZERO's armour, exposing a glowing head-core which is very much susceptible to the hammer.

As with other Sonic Adventure bosses, ZERO starts to vary his attacks as he takes more damage. Jumping shockwave-blasts add to the missiles, and later the robot holds still in the center of the ring and spins his electrified wire-arms around the whole arena. Defeating him concludes Amy's story.

Connection to the E-100 Series

ZERO is never referred to as an E-100 Series robot, or as "Alpha", in Sonic Adventure or its associated strategy guides. However, the name "E-100 Alpha" is canonical, appearing in Amy's section on the Japanese-language Sonic Adventure Dreamcast homepage. The name Alpha also appears on the less-defunct Japanese Sonic Channel page for Gamma.[3]

During the opening cutscene of Gamma's story, Eggman calls him "the second of my E-100 robots". Since Beta is the other one, this implies that Eggman does not consider ZERO to be a true E-100 model. Additionally, unlike the other E-100 Series robots, there is no animal organic battery inside ZERO when he explodes after the boss.



Sonic Adventure
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Main page (SADX)
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Dr. Eggman's E-100 Series of Robots
E-100 Alpha | E-101 Beta (Mk II) | E-102 Gamma | E-103 Delta | E-104 Epsilon | E-105 Zeta | E-121 Phi | E-123 Omega
Characters in the Sonic the Hedgehog game series
Heroes   Sonic (Super, Hyper, Darkspine, the Werehog, Excalibur) | Tails (Super) | Knuckles (Super, Hyper) | Amy Rose | Cream | Big | Blaze (Burning) | Emerl | Silver (Super) | Marine | Lumina Flowlight | Chip | Shahra | Knights of the Round Table | Caliburn | Yacker | Sticks | Avatar
Anti-heroes/ Neutrals   Shadow (Super) | Rouge | Espio | Charmy | Vector | Mighty (Super) | Ray (Super) | Chaos (Perfect) | E-102 Gamma | E-123 Omega | Bean | Bark | Jet | Wave | Storm | Shade | Merlina
Villains   Dr. Eggman | Metal Sonic (Rocket, Neo, 3.0) | Mecha Sonic (Super) | Fang | Witchcart | Battle Kukku Army (15th, 16th, Dr. Fukurokov) | Tails Doll | Metal Knuckles | E-Series | ZERO | Void | Biolizard | G-merl | Eggman Nega | Black Doom | Shugo-hei | Iblis | Mephiles | Solaris | Erazor Djinn | Captain Whisker | Johnny | Master Core: ABIS | Ix (Super) | Dark Gaia | King Arthur | Orbot | Cubot | Deadly Six (Zavok, Zazz, Zomom, Master Zik, Zeena, Zor) | Hard Boiled Heavies | Infinite
Teams   Sonic/Heroes | Rose | Dark | Chaotix | Babylon
Other   Gerald & Maria Robotnik | Froggy | Chao (Hero, Dark) | Omochao | Cheese | Chocola | Vanilla | Tikal | Pachacamac | E-101 Beta | Illumina | President | G.U.N. Commander | Elise | Duke of Soleanna | Coconut Crew | Vikings | Professor Pickle | Wentos | Don Fachio | Dodon Pa | Heavy and Bomb | Tiara Boobowski | Honey | Flicky | Animals | Wisps