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This character exists primarily within the Sonic X continuity.
Information in this article may not be canonical to the storyline of the games or any other Sonic continuity.

E-104 Epsilon (E-104 "イプシロン" E - 104 "Ipushiron"?) is a character that appears in the anime series Sonic X. It is a robot created by Dr. Eggman, and the fourth unit in the Doctor's E-100 Series. Epsilon, along with its brethren, were created during the Chaos incident to aid the doctor. After failing its first mission, Epsilon was permanently shut down by E-102 Gamma.


E-104 Epsilon was a humanoid robot colored in orange and white. It possessed no neck, its head and torso coming together in an almost ellipsoid shape. Its torso was orange with a wide and white vertical stribe down the middle, and possessed a head light with a hexagonal gray frame on the right side. It also had gray mufflers surrounding the pelvis area, and had the number "104" painted in white on the right of its large vertical stripe and the left side of its rear. Its head meanwhile was small and platform-like with a yellow shade and green cylindrical eyes. It also had a hexagon-shaped disk hovering behind its neck.

Epsilon's shoulders were black vertical cylinders. Attached to each of them were Epsilon's arms, which were long and designed with two joints; each of Delta's forearms were designed as orange, gray and black missile launchers. Also, Epsilon's upper arms were orange, while the parts between its upper arms and forearms were gray. Epsilon 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 its legs in particular were orange while the rest of them were gray, except from its calves, which were thick and orange.



Chaos Saga

E-104 Epsilon, along with Beta, Gamma, Delta and Zeta, were created by Dr. Eggman as a part of the Doctor's new line of E-Series robots; The E-100 Series. Each of these four used small animals as batteries. Upon its activation, Epsilon was given a shooting-range test, which it passed with flying colors, before being given its codename.[1]


Epsilon heading out on its first mission.

Epsilon and the rest of its brethren were soon after assigned by Eggman to find a frog with a tail, which was essential to Eggman's plans. After departing, Epsilon found what it thought to he the frog Eggman sought, and returned to the Egg Carrier. Back onboard with the crew however, it was revealed that Epsilon had gotten the wrong frog, much to the anger of Eggman. When it turned out that only Gamma had gotten the right frog, Eggman had Epsilon, Beta and Delta discarded as punishment for their incompetence.[2]

Epsilon eventually ended up in a cave containing a statue of Eggman. It was soon after found by Gamma, who had set out on its own to "save" its robotic brethren. While Epsilon was docile, Gamma reprogrammed Epsilon by deleting its master entry of Dr. Eggman. This caused Epsilon to shut down and release the animal powering it.[3]


Lacking in overall autonomy but possessing a degree of emotional capacity, Epsilon was best defined by its loyalty to Dr. Eggman, whom it only sought to serve, as per its directive. As such, it followed Eggman's orders without question. However, it was also shown to fear Eggman's wrath.[2]

Epsilon was not necessarily very bright, easily believing the first frog it found to be the one Dr. Eggman searched for.[2]

Powers and abilities

Epsilon was equipped with twin missile launchers and possessed excellent marksmanship skills.[1] It was also equipped with a hover disk on its back that granted it the ability to fly.




Concept artwork



See also


  1. 1.0 1.1 Yoshimura, Kiyoko (18 September 2004). "Pure Chaos". Sonic X. Season 2. Episode 27.
  2. 2.0 2.1 2.2 Houjou, Chinatsu (2 October 2004). "A Robot Rebels". Sonic X. Season 2. Episode 29.
  3. Shiraishi, Masahiko (16 October 2004). "Revenge of the Robot". Sonic X. Season 2. Episode 31.