Metal Sonic

"I was created for the sole purpose of destroying you."

- Metal Sonic about his purpose of destroying Sonic.

Metal Sonic is a robotic version of Sonic the Hedgehog built by Dr. Eggman. He is the secondary main antagonist in the Sonic the Hedgehog series and is its second most recurring villain, only behind Eggman himself. Metal Sonic speaks only in beeps and other mechanical sounds.

Sonic CD
Metal Sonic is the secondary main antagonist of Sonic CD. After Eggman attacks the Miracle Planet, Metal Sonic takes full control of it (as seen on holograms). Metal Sonic first appears to kidnap Amy and escapes with her to the Stardust Speedway. Sonic (and Tails as the 2011 re-release is made canon to help understand Sonic 4: Ep II and Metal) later races Metal Sonic in the speedway and after an intense battle, Metal Sonic is defeated, sending him crashing into a wall and falling over the edge.

Sonic the Hedgehog 2
See: Silver Sonic A prototype of Metal Sonic attacks Sonic on the Death Egg in Sonic the Hedgehog 2.

Sonic & Knuckles
See: Mecha Sonic (Sonic) Another Metal Sonic attacks Sonic, Tails and later Knuckles in the Sky Sanctuary in Sonic 3 & Knuckles, even gaining a super form.

Episode I
After Eggman's defeat, Eggman hovers over an unknown figure and laughs. The unknown figures eyes glow, revealing him to be Metal Sonic.

Episode Metal
Metal Sonic is the main character in Episode Metal. He first awakens on the Stardust Speedway and is powered up by Eggman after his defeat in CD, he then leaves and meets Eggman at the Mad Gear, Eggman powers him up again and sens him to gather an ancient Negative-Chaos artifact. Metal Sonic goes to the Labyrinth and obtains the artifact, Metal Sonic is substantially powered up by the Negative Chaos and flies off through the Casino in search of Sonic, the continuing to Splash Hill Zone, he then sees Sonic and Tails flying away and follows them on Tails' rocket.

For some reason, Eggman robots would always attack him, though it can assumed that the Badniks assume Metal is Sonic or that they're meant to help sharpen Metal's skills.

Episode II
Metal Sonic eventually catches up to Sonic and Tails in the Carvival, Metal Sonic proceeds to battle them with his new powers, but is defeated by their combined abilities. Metal Sonic then appears to attack them as they are about to catch Eggman, he pilots his Metal Carrier and attempts to shoot down the Torando, but leaves after being damaged. He then returns with his Metal Carrier to fight them, but is defeated and retreats to the Death Egg MK.II with Eggman, he and Eggman then engage Sonic and Tails in battle, with Metal Sonic launching powerful attacks at the two while Eggman uses his vehicle as a shield, after being defeated they retreat. Metal Sonic then retreats the duo on a copy of Stardust Speedway and races them, they just barely defeat him.

Knuckles' Chaotix
Metal Sonic appears as the second to last boss and is defeated by Knuckles, Mighty, Espio, Charmy, and Vector. He later serves as the final boss alongside Dr. Robotnik, in a form known as Metal Sonic Kai. They defeat them, but the evil duo survive.

Sonic Triple Trouble
Metal Sonic appears in the Atomic Destroyer Zone as the second to last boss. He is defeated by Sonic and Tails, and flies away.

Sonic the Fighters
Metal Sonic, again, is the second to last boss, although he serves as more "final boss" material as Robotnik goes down quicker. Sonic defeats him and knocks him out, setting the Death Egg 2 to selfdestruct. However, Metal Sonic and Robotnik both escape the explosion.

Sonic R
Metal Sonic appears as one of the contestants racing Sonic on Eggman's behalf. In the final stage Sonic defeats Metal Sonic, Tails Doll, Metal Knuckles, and Egg Robo.

Sonic Adventure
Metal Sonic with his own story in Sonic Adventure. It is likely that his story is a Training Simulation. Metal Sonic's story is a copy of Sonic's own.

He can be seen inside a tank aboard the Egg Carrier, presumably being modified into his Modern appearance and updated, after his defeat in Sonic R.

Sonic Adventure 2
Metal Sonic appears as a character in Multiplayer mode, competing with the other characters. Metal Sonic can use Sonic and Shadow's moves along with the impenetrable Black Shield.

Sonic Heroes
See: Neo Metal Sonic Metal Sonic is also the main antagonist of Sonic Heroes disguised as Eggman throughout most of the game, while locking the real Eggman on his flagship, and also pretends to be Sonic for a short time, he takes on the form of Neo Metal Sonic. Metal Sonc confronts the heroes multiple times so that he can defeat them and copy their data, he succeds in copying all of their data and reveals that he is Metal Sonic and then fires a lightning bolt that destroys the ship and transforms into a much more powerful form known as Metal Overlord. Team Chaotix, Rose and Dark fight aggainst him but are no match for his power so Team Super is forced to battle him. Once defeated he returns to his original form and is knocked out. Sonic says he's ready for a rematch if Metal Sonic ever wants one.

Sonic Free Riders
Despite being taken by Shadow and Omega after his defeat, Metal Sonic returns, apparently having been taken back by Eggman and reprogrammed to serve him again. However, Metal Sonic betrays Eggman again. Disguised as E-10000B, he absorbs racing data, seemingly for Eggman's Extreme Gear, but really takes it all for himself and races Sonic as the final boss, but loses, and runs off. Before racing Sonic, he seems to challenge him to the rematch Sonic promised him in Sonic Heroes.

SONIC THE HEDGEHOG
Metal Sonic was originally going to appear as a playable character with his own story but was scrapped (as with Tails, Knuckles, Rouge, Omega, Amy and Blaze's own stories). He would be doing various things in Soleanna for Eggman, such as kidnapping Elise or leading the Badniks. He also would have fought Tails, Sonic, Omega & Silver, and would have been the antagonist of Tails's story in an attempt to parallel their roles as sidekicks (as well as the fact that both have the same abilities such as supersonic speed and flight). In his story, he would have also questioned his existence, such as asking himself why Eggman was against him in trying to destroy Sonic in Heroes, despite being the reason for his creation. In the end he would have sadly decided that his true purpose was to serve Eggman regardless of his own thoughts.

In his story, whenever he was thinking, he would have had an audible voice provided by Jason Grittih, but whenever he attempted to speak outside of his thought, he would communicate with his usual beeping noises, leading to awkward situations with most of the cast who could never understand him (Silver calls him "outdated" because of this, which caused their fight), with only Eggman, Sonic, Omega and Tails being able to understand him. When fighting Sonic, Omega & Silver, it would've been a regular rival battle (he would've have beaten Silver in the fight and draw with Omega, but lose to Sonic) but when fighting Tails (who's story he was the antagonist of), he would have fought him three times; the first two with Eggman's boss machines, and the last in a brutal high-speed sky battle while Sonic fought the Egg Wyvern, on his own. In the end, Tails would've kicked Metal in the head, causing him to malfunction and fall into the sea, but would later be rescued by Eggman (who survived his own battle with Sonic).

Sonic Rivals
Metal Sonic appears working for Eggman Nega, possibly reprogrammed to serve him. Sonic, Knuckles, Shadow, and Silver must fight him as well as Eggman Nega. He takes part in the final battle.

Sonic Rivals 2
Eggman reprograms Metal Sonic as a more mindless servant loyal to him, and pairs him up with Shadow to defeat Eggman Nega and prevent his plans for releasing the Ifrit on Earth. Upon entering the Ifrit's dimension, Shadow and Metal Sonic close the portal from the inside, but fight the Ifrit and Metal Sonic 3.0. In the end, they destroy the Ifrit, and presumably Metal Sonic 3.0 as well (since Eggman Nega turned to his enemies Silver and Espio for help when he was trapped under rubble). Presumably because of being the last ones to fight the Ifrit and having to deal with Metal Sonic 3.0, Shadow and Metal Sonic don't make it through the portal, but Metal Sonic cuts out his chassis to reveal a Chaos Emerald inside him, which he and Shadow use to teleport back to Earth.

Sonic Generations (Classic)
In Sonic Generations, Classic Metal Sonic is a rival boss. While waiting for Sonic in the Sonic CD timeline, he enters the limbo created when Eggman used the Time Eater to break the timeline, and challenges Classic Sonic to a racelike battle over the purple Chaos Emerald. In the Handheld version, Metal Sonic engages in a race across the Casino Night. In the Console version, They enter the bad future of Stardust Speedway from Sonic CD and battle while running across a crumbling path, and the fight ends with Classic Sonic kicking Metal Sonic into the air, and he explodes. He can still be found in the White Space and will offer a challenge if you approach him. (much like every stage and boss in the game).

"Sonic the Hedgehog OVA" (Sonic the Hedgehog: The Movie)
Like in Sonic CD, Metal Sonic was built by Robotnik using captured data from Sonic such as combat moves and personality traits, being the secondary villain of the film Sonic the Hedgehog: The Movie, Metal is a constant thorn in Sonic's side, with their encounters leading to an epic battle, Metal was eventually fatally damaged in the battle, with Sonic's personality running through his programming his final act was saving the president of Möbius' life before falling into a volcano, refusing to allow Sonic to save him from his death as "there can be only one Sonic".

Personality
Metal Sonic thinks of himself as the real Sonic and as such has an intense hatred for the Blue Streak and his friends. Unlike Sonic, Metal Sonic is also a complete megalomaniac who sees himself as the ultimate life-form and is happy to do whatever it takes to prove it.

Other Robot Sonics
Metal Sonic is often confused with Mecha Sonic and Silver Sonic, in some media they are the same villain but in others they are separate beings - this is a trait shared by many Sonic villains (perhaps due to the original games having little true plot, thus the later games and comics had to improvise). Metal Sonic is the second robotic version of Sonic to appear chronologically, and has appeared in many games (whereas Mecha Sonic and Silver Sonic have only appeared in very few games). With the release of Sonic the Hedgehog 4: Episode Metal it is confirmed that Metal Sonic is separate to Silver Sonic and Mecha Sonic.