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Sonic Wiki Zone
Sonic Wiki Zone

No, here's the real one!

— E-105 Zeta, Sonic Adventure

E-105 (E-105 Ī 105?), codenamed 𝛇 or Zeta (ゼータ Zēta?), is a character that appears in the Sonic the Hedgehog series. He was the fifth E-100 Series robot created by Dr. Robotnik during the Chaos incident to aid in the destruction of Station Square.[1] Tragically, however, after a mission failure, Zeta was remodeled as a stationary defense unit in the engine room of the Egg Carrier, where he was destroyed by E-102 Gamma.[2][3]



Zeta before his reconstruction, from Sonic Adventure.

E-105 Zeta started out as a humanoid robot colored in mainly purple and white. He possessed no neck, his head and torso coming together in an almost ellipsoid shape. His torso was purple with a wide and white vertical stripe down the middle and possessed a headlight with a hexagonal gray frame on the right side. He also had gray mufflers surrounding the pelvis area and had the number "105" painted in white on the right of his large vertical stripe and the left side of his rear. His head meanwhile was small and platform-like with a yellow shade and green cylindrical eyes.

Zeta's shoulders were black vertical cylinders. Attached to each of them were Zeta's arms, which were long and designed with two joints; his left arm held Zeta's black-gray blaster while his right arm had a tri-digited hand with two points of articulation on each digit. Also, Zeta's right upper arm was purple with yellow-orange cuffs, while the parts between his upper arms and forearms were gray. Zeta also possessed two long and inverted legs with five points of articulation and large, black feet with two sharp toes and roller wheels on the heels. The upper sections of his legs in particular were purple while the rest of them were gray, except from his calves, which were thick and purple with gray and yellow-orange cuffs.

After getting remodeled, Zeta appeared very different from other units in the E-100 Series. Although Zeta retained his head and upper torso, these elements would rest on top of what mostly resembled a large stationary tower with a color scheme matching Zeta's. His tower form was round on the sides, with his upper torso section being raised above a wide plaform-like section with a black bottom. He also had seven rocket turrets around his perimeter and had green lights in various places. Most of Zeta rested upon a gray high-tech pillar. He also had several pipes attached to the platform below his upper torso, all of which were bent downward.


Sonic Adventure[]

In Sonic Adventure and its enhanced port Sonic Adventure DX: Director's Cut, Zeta was created as the fifth unit in the E-100 Series of shooting robots in order to aid Dr. Robotnik in his agenda to destroy Station Square and build Robotnikland on its ruins.[1] At some point, E-105 was able to become part of the Egg Carrier's crew, alongside E-102 Gamma, E-103 Delta, and E-104 Epsilon. There, Robotnik tasked them to retrieve Froggy, who had swallowed a Chaos Emerald. However, Zeta failed to locate the correct frog, and the doctor remodeled him, Delta and Epsilon. While E-103 and E-104 were banished from the Egg Carrier,[2] E-105 was rebuilt into a stationary defense unit in the engine room of the Egg Carrier,[2][3] unable to move, but boasting far more armaments.

Not long after, Gamma, who had defected from Robotnik and set out to "save" his fellow E-100 brethren, found Zeta in Hot Shelter, and the two robots engaged in battle. In the end, Zeta was destroyed, and the Peacock powering him was released.

Other game appearances[]

Sonic Rivals[]

In Sonic Rivals, Zeta appears as the 138th collectable card in the game.

Powers and abilities[]

As part of the E-Series, Zeta was a very advanced robot that was developed to advance weaponry.[4]





E-105 Zeta is the fourth boss in E-102 Gamma's storyline in Sonic Adventure, its enhanced port Sonic Adventure DX: Director's Cut, and the 2010 remaster. In Adventure Mode and Trial Mode, he is fought at the end of Hot Shelter. He is only encountered with Gamma.

Boss guide[]

To defeat E-105 Zeta, the player must destroy the large turrets surrounding the robot. They should run around the arena and flash Gamma's targeting Laser Gun toward the robot when possible. When Zeta launches a volley of missiles from his turrets, the player must keep moving to lure them off course, or target and destroy them. Each time Gamma blows off a turret, E-105's life gauge drops. After landing a total of seven hits, Zeta will be defeated.


Title Artist(s) Music track Length
"Heartless Colleague ...Boss: E-Series Targets " Jun Senoue, Yoshitada Miya 1:25


In other media[]

Sonic X[]

Main article: E-105 Zeta (Sonic X)

In the Sonic X anime series, E-101 Beta replaced much of Zeta's role, with Zeta only appearing in "Revenge of the Robot". After the Egg Carrier crashed, Gamma came onboard, found Zeta and shut him down.

Archie Comics[]

Main article: E-105 Zeta (Archie)

In the Sonic the Hedgehog comic series and its spin-offs published by Archie Comics, E-105 Zeta was destroyed by E-102 Gamma, similarly to Sonic Adventure.


  • The lower half of Zeta's frame is built out of Dreamcasts, inserted by Sonic Team as an Easter egg. This is present in all versions of Sonic Adventure.[citation needed]
  • Zeta is one of two E-100 Series robots in Sonic Adventure to receive a physical upgrade and change in appearance (the other being Beta). The remaining E-100 Series robots, including Gamma, only received enhanced Arm Cannons.
  • Excluding E-101 Mark II, Zeta is the only boss for E-102 Gamma who does not have a Jet Booster.






  1. 1.0 1.1 "All Star Cast". Sonic Adventure Tokyo International Forum Unveiling Booklet. 22 August 1998. p. 9.
  2. 2.0 2.1 2.2 "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. 122. ISBN 978-4757203006.
  3. 3.0 3.1 Sega (22 July 2016). Act:005 創造主の傑作プレゼン. Sonic Channel. Archived from the original on 17 April 2022. Retrieved on 21 May 2022.
  4. Toyoda, Eitaro (2017). "Dr. Eggman in... My Greatest Invention". Sonic the Hedgehog: Rival Edition. Tomy.

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