E-Series

The E-Series are a group of robots created by Doctor Eggman, who uses them in his quest to conquer the world. They are considered to be elite versions of the Badnik robots Eggman used in earlier games. The name was first used in Sonic Adventure, and almost all of Eggman's robots between Sonic Adventure and Sonic Heroes were given an E-Series designation.

The most famous E-Series robots are the E-100 Series from Sonic Adventure, particularly E-102 Gamma (who was a playable character in that game) and E-123 Omega (who has been a recurring character since his introduction in Sonic Heroes). E-123 Omega has also made appearances in Shadow the Hedgehog, Sonic 06 and Sonic and the Dark Brotherhood.

The E-Series is the last series of Eggman's robots to use captured animals as a power source (referred to in some continuities as an organic battery), with more recent efforts such as the mass-produced Egg Pawn series no longer using animals in this way.

E-100
The E-100 Series are the most prominent E-Series robots, being the only ones whose E-Series designations were revealed in-game. They were introduced in Sonic Adventure, in which they were prototype gunner robots. Almost all were equipped with some sort of lock-on target ammunition, though its utility varied between models. Unlike many of Eggman's robots, some of the E-100 series were important characters in their own right. The most prominent was E-102 Gamma, who was a playable character during the game. The E-100 series were also given Greek letter names. All E-100 robots except ZERO appear on collectable cards in Sonic Rivals. But instead, ZERO appears as a card in Sonic Rivals 2.

Known E-100 robots include: There is also an Unidentified robot, that fans refer to as E-106 Eta.
 * E-100 Alpha (α) (aka ZERO)
 * E-101 Beta (β)
 * E-102 Gamma (γ)
 * E-103 Delta (δ)
 * E-104 Epsilon (ε)
 * E-105 Zeta (ζ)
 * E-107 Theta (Θ) In the Mobius: X Years Later Alternate Universe.
 * E-121 Phi (φ)
 * E-123 Omega (ω)

Isaac


While not technically a member of the E-100 Series, Isaac is a robot from the Sonic the Hedgehog comic series, and his design is simply a golden recolor of E-102 Gamma. He was created in the distant past by Professor Niven Clarke and was subservient to Dr. Ivan Kintobor. Activated when the Xorda aliens launched their first assault on Earth/Mobius, he monitored Kintobor while he was in stasis in his bunker.

Rediscovered by Shadow and Metal Sonic in the present day, he recounted his experiences of observing history from afar, including the first conquest of Mammoth Mogul and the coronation of the first king of the House of Acorn. Isaac is shown to maintain a nuclear launch silo beneath the bunker, and still tends to the dormant body of Ivan Kintobor. By unknown means, data was stolen from him by Dark Legion scientist Dr. Finitevus.

It is possible there is a link between Isaac and the SWATbot identified as Isaac by Ian Droid in Sonic Super Special #7, but it is untrue that Robotnik stole Isaac's design and used it for his E-Series.

Sonic Adventure robots
The first use of the term E-models was in Sonic Adventure. Although most often connected with the E-100 Series of gunner robots that were prominent in that game (see above), other minor robots were also considered E-models. They are listed here.
 * E-01 Baby Kiki - a monkey robot that throws bombs
 * E-02 Rhino-Tank - rhino robot that charges at high speeds
 * E-03 Sweeper
 * E-04 Leon - a chameleon that turns invisible
 * E-05 Boa-Boa - caterpillar robot that emits flames
 * E-06 Bladed Spinner (Spina) - bat robot that spins
 * E-07 Ice Bot - small purple robot that sprays ice
 * E-08 Kart Kiki - monkey robot that drives bumper cars
 * E-09 Buyoon - balloon robot that can only be destroyed by the head
 * E-10 Cop Speeder - robot that chases you
 * E-15 Spiky Spinner (Spiked Spina) - spiked version of E-06
 * E-16 Electro Spinner (Thunder Spina) - electricity-emitting version of E-06
 * E-17 Ghora - red sphere robot with flames circling it
 * E-19 Egg Keeper
 * E-22 Beat
 * E-24 Jetso
 * E-25 Duo Jet
 * E-26 Bomb Jet
 * E-27 Hyper Jet
 * E-28 Mecha Fish
 * E-29 Egg Pirate

E-100 Series
The E-100 robots that appeared in Sonic Adventure were:
 * E-100 Alpha (α) (aka ZERO)
 * E-101 Beta (β)
 * E-102 Gamma (γ)
 * E-103 Delta (δ)
 * E-104 Epsilon (ε)
 * E-105 Zeta (ζ)

Sonic Adventure 2 robots

 * E-20 Kiki - a monkey robot that throws bombs
 * E-31 Gola - a red sphere robot with flames circling it
 * E-32 Unidus - a black sphere robot with spiked balls circling it
 * E-1000 - a mass-produced variant of E-102 Gamma

E-01
There is a large machine in Death Chamber in Sonic Adventure 2. It is a very large, immobile, four-wheeled cylindrical unit the height of the central area it is positioned inside. Its "E-01" decal can be found near the top of its metallic outer shell. It is unknown if it is technically one of the E-Series robots, although it could be the base's central control computer.

Sonic Heroes robots
In the game Sonic Heroes, Doctor Eggman had progressed to an E-1000 and E-2000 series of robots.
 * E-123 Omega (ω)
 * E-1001 Egg Pawn - Orange Eggman-shaped robots that carry various weapons
 * E-1002 Egg Flapper - multicolored flying robots with various weapons
 * E-1003 Cameron - turtle bots with cannons
 * E-1004 Klagen - jellyfish bots that grab your team members
 * E-1005 Egg Knight - gold Egg Pawns that lead armies of enemies
 * E-1006 Egg Hammer - giant black robots with hammers
 * E-1007 Heavy Egg Hammer - armored Egg Hammers
 * E-1008 Falco - bird robots that look like the Egg Hawk
 * E-1009 Egg Bishop- Egg Pawns that can heal other robots
 * E-1010 Egg Magician - Egg Pawns that can steal rings
 * E-1011 Casino Pawn - Egg Pawns Found in Zone 3
 * E-1012 Rhino Liner - mini train cars reminiscent of Rhino-Tank
 * E-1013 Rook

Also appearing in this game was the final E-100 robot, E-123 Omega, who was an individualistic playable character, much like E-102 Gamma.

Sonic Battle robots

 * E-121 Phi (φ) - gray clones of Emerl the Gizoid
 * E-102 Chaos Gamma (γ) - rebuilt and upgrade of Gamma with two weapon arms

Sonic Riders robots (E-10000)
Sonic Riders featured yet another branch of the E-Series. This time, the E-10000 series. A difference in this branch is that they are referred to by color, as opposed to by name and number. The E-10000 robots appear to be similar in appearance to Eggman, but more advanced. Except for color, they both seem to have the same, basic structure. They are also equipped with a targeting and analyzing mode, similar to what is displayed by E-102 Gamma.

Known E-10000 robots include:
 * E-10000R
 * E-10000G
 * E-10000Y
 * E-10000P
 * E-10000B

Typing errors
On the American Sonic Riders website, E-10000G and E-10000R accidentally got their stats (and possibly bios) reversed, and the website claimed that G was speed and R was power (it also lists their names as "Robo 1" and "Robo 2"). The Japanese website was correct, but in E-10000G's bio, it said the name "E-10000R" instead and vice versa. When the game came out, G turned out to be power and R was speed.

Sonic X robots
Several robots from the E-Series appeared only in Sonic X. These robots are not canon to the games, and given differences between the Sonic X continuity and the game continuity, there may be some conflict between numbers. The robots are as follows:
 * E-11 Beacon - Episodes 4, 12 & 13. Beacon is a purple bird robot, which Eggman first activated to help him retrieve a Chaos Emerald, but it is destroyed by Sonic. Eggman later activates a second Beacon model to help ward off an attack by G.U.N.'s air force.
 * E-12 Behemoth - Episodes 1, 11, 12, & 28. Giant mass-produced humanoid robot that protects Eggman's base. Sonic destroys several of them before finding Eggman. One of the few recurring robots from the series.
 * E-13 Guardbot - Episode 1, 11-13. Basically a machine gun turret on tank treads. One of these robots break Eggman's Chaos Emerald device, and is as such the reason why everyone is sent to Earth. Ironically, it is number 13, which is considered an unlucky number, and broke Eggman's device.
 * E-14 Sneezer - Episodes 11, and 12. A missile-launching robot that protects Dr. Eggman's headquarters. Two boxy launchers make up its 'arms', while an extra trio of missiles adorn its head.
 * E-18 Guerra-Hard - Episode 13.
 * E-21 Ballios - Episode 10. A team of athletic robots built for playing baseball. They challenge Sonic and co. to a game, the winner of which gets a Chaos Emerald. They are beaten and destroyed. A Ballios is 120 cm tall and weighs 120 kg.
 * E-23 Missile Wrist - Episode 3. Missile Wrist is equipped with missile-like grappling hooks attached to retractable cords in place of its hands. To start his campaign to take over Earth, Eggman unleashes Missile Wrist to cause havoc in Station Square, only for it to be destroyed by Sonic.
 * E-30 Laser Tank - Episode 1. The Laser Tanks were fairly large, mass produced robots seen in the first episode of Sonic X. They are never seen again, even during the attack on Eggman's Base halfway through the first season, giving the impression that they were all destroyed when Sonic tried to stop Eggman from using Chaos Control.
 * E-33 Buball - Episode 2 & 15. First briefly seen floating around Eggman's base in the second episode, these small, round, floating laser-shooters came into play during Eggman's massive attack on Station Square using the Egg Fortress. The Buballs were remarkably weak for Sonic X, such that several of them were destroyed by Mr. Stewart and Tanaka.
 * E-35 Funfun - Episode 12. A giant yellow bird robot with an equally giant fan that is used to stop Sonic and his friends from getting a Chaos Emerald. It is powerful enough to blow away the X-Tornado, but is destroyed regardless. Funfun was 9 meters tall and weighed 3 tons.
 * E-38 Octoron - Episode 9. An octopus robot that Eggman uses in order to try to drown Sonic. It fails and is destroyed..
 * E-39 Quizon - Episode 9. An army of construction robots with four arms with various tools. Eggman uses them to build a theme park in his image, and when Sonic arrives they combine into a long snake-like robot that is destroyed by Amy. A Quizon is one meter tall and weighs 150 kg.
 * E-40 Egg Fortress - Sonic X Episodes 15-20, 47. Following the subsequent destruction of his original headquarters, Dr. Eggman reappeared from under the wreckage with a new mobile air fortress. Purple in color, the ship was designed with a trio of massive drills, one on the prow and two on the wings. A retractable bridge and three gigantic rocket engines added to this ships appearance. Armed with a battery of flak cannons and missile launchers, the Egg Fort also carries a pair of high-powered Egg Blasters, which in it's initial usage nearly destroyed the X-Tornado outright. After numerous defeats and repair work, Eggman retired the Egg Fort in Episode 20 in favor of the Egg Fort 2. The Egg Fort was resurrected in Episode 47, having been commandeered by GUN forces into a airship of their own to combat Eggman's new Egg Battleship. It is uncertain what happened to the craft after the assault on the equator.
 * E-42 Torole - Episode 15. A bipedal walker robot armed with a wrecking ball that bared resemblance to one of the bosses in one of the first Sonic the Hedgehog games. It was destroyed by the heroes. Torole was 12 meters tall and weighed 40 tons.
 * E-43 Falcon - Episode 15. Mass-produced orange bird robot. Several chase Sonic, but he hops on and rides one to the Egg Fort.
 * E-45 Sumo-man - Episode 21. Eggman sends Sumo-man, an extremely strong, but unintelligent robot, to stop Sonic from winning a race with Sam Speed. Too big and slow to catch Sonic, Sumo-man takes it out on himself, hitting himself in the face. Underestimating his own strength, Sumo-man is sent flying and crashes into Eggman's base. Sumo-man was 12 meters tall and weighed 30 tons.
 * E-47 Pumpty - Episode 5. Not to be confused with Humpty, a robot from Dr. Robotnik's Mean Bean Machine.
 * E-51 Intelligente (US)/Teacher Robot (Japan) - Episode 6. Intelligente is a robot teacher designed to interact with kids, and Eggman intended for him to brainwash the children into liking him. However, Intelligente became loved himself, and did not want to serve Eggman. He was forced into it again, He attacked Sonic with his "homework attack" (a missile launcher hidden under his hat) but sonic dodged all his missiles and destroyed him.
 * E-57 Clurken - Episode 16. A jellyfish robot sent to stop Sonic from acquiring an underwater Chaos Emerald. It was destroyed. Clurken was 27 meters tall and weighed 12 tons.
 * E-65 Gorru-Gaooh - Episode 18. A gorilla robot piloted by Decoe and Bocoe. It uses camouflage technology that renders it invisible, but Sonic destroys it regardless. Gorru-Gaooh was 8 meters tall and weighed 10 tons.
 * E-66 Da-Dai-Oh - Episode 22. A gigantic robot that Eggman brings with him during his vacation. It looks like a large metallic dome with legs, arms, and a head where Eggman is seated. It had extendable arms and spiked balls for hands, but was destroyed when it slipped on some unsteady ground. It was 100 meters tall and weighed 1000 tons.
 * E-70 Noizi - Episode 11. A robot equipped with super powerful sound wave generators, Noizi was set to guard Eggman's fortress. He nearly defeated Topaz and Rouge, but was bested when Rouge threw a bomb into its main speaker and set it off. Noizi was 8.2 meters tall and weighed 2.5 tons.
 * E-74 Weazo - Episode 23. A large green weasel-like robot equipped with a flamethrower, Weazo comes along to help Eggman retrieve the purple Chaos Emerald. However, despite its power, it is beaten by a tag-team effort from Sonic and Knuckles. Weazo was 7 meters tall and weighed 14 tons.
 * E-77 Lucky - Episode 25. Designed to be the ultimate lucky charm, Lucky's ridiculous and clumsy body is covered in good luck charm symbols. Lucky was dispatched to locate the seventh Chaos Emerald, but wasn't doing a good job because it kept falling over. Eventually, Lucky found it, and was going to give it to Sonic. Caught in a battle between Eggman and G.U.N., Lucky turned out to live up to his name, constantly dodging attacks that should have destroyed him. He also has the ability to fly. Lucky later appeared in a fighting tournament, and made it to the semi-finals because for certain reasons, such as his opponents never showing up or were forced to leave before fighting began. Unfortunately, his luck ran out when he had to face Emerl, as his victory dance burned out the remaining energy in his power cells and subsequently shut-down. Lucky was one meter tall and weighed 100 kg.
 * E-88 Lightning Bird - Episode 24. An ostrich-like robot. Sonic destroys a few and gets a part of one stuck in his ear. A Lightning Bird was 13 meters tall and weighs 25 tons.
 * E-90 Super Sweeper - Episode 8. A giant spacecraft, Eggman dispatched it to suck up satellites to grind into robot parts. Equipped with powerful missiles and lasers, a powerful suction force, and the ability to fly higher and faster than Tails' Tornado, Sweeper was seemingly unbeatable. However, it was no match for the improved X Tornado, and was destroyed by Sonic. It looks remarkably similar to the airplane Thunderbird 2 from Thunderbirds.
 * E-91 Lady Ninja / Ku-no-ichi (Japan) - Episode 17. A robot based off of a female ninja, E-91 was equipped with shurikens, gliders, an electrocution net, a chain with a weight at the end that could either be small or turn into a wrecking ball, and an entire arsenal of different Ninjutsu techniques. Her name is a pun; the word "Kunoichi" means "Lady Ninja", but when the word is separated, it also means "91" (Ku-no-ichi). The Lady Ninja was dispatched to retrieve the red Chaos Emerald, but ran into trouble in the form of Knuckles the Echidna and Rouge the Bat. Eventually, she had Knuckles on the ropes, but Knuckles' human friend Hawk dumped water over her. Taking advantage, Knuckles hit her with a super punch, destroying her. Lady Ninja was 120 cm tall and weighed 200 kg.
 * E-99 Eggsterminator (US)/Egg Emperor (Japan) - Episode 26. The robot form of the Egg Fort II, the Eggsterminator was unleashed by Eggman when he was facing both Sonic and G.U.N.'s Beetle robots. Powered by six Chaos Emeralds, Eggsterminator could move faster and attack stronger than Sonic. Unfortunately, all the power sent him out of control, causing him to attack Sonic and co. without hesitation and glow an orange color. However, Eggsterminator was destroyed when Super Sonic, charged up with the energy of all seven Chaos Emeralds, rammed through it multiple times. The Eggsterminator was named "Egg Emperor" in Japan, and the name may have been changed to avoid confusing it with the "Egg Emperor" from Sonic Heroes.
 * E-3000 Egg Mars - Episode 56. A large robot that Eggman deploys in battle against a frog-like Metarex and in his efforts to acquire a Chaos Emerald. It was destroyed by the Metarex. E-3000 Egg Mars is similar to E-18 Guerra Hard from episode 13.
 * Others - When Eggman chooses robots with cards upon placing them into a random-selecting slot machine (the selected robot appears on the 3 reels), several robots (or parts of them) can be seen that were never used.

Trivia

 * The E-100 robot's code names are named after the Greek Alphabet. Alpha, Beta, Gamma, Delta, Epsilon, and Zeta are all letters from the Greek Alphabet.