Metal Sonic

Metal Sonic is a robot version of Sonic the Hedgehog built by Dr. Eggman. He is a major antagonist of Sonic CD. Sonic must race him in Stardust Speedway Zone. When Sonic beats him Metal Sonic is destroyed by a beam.

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 serves as the final boss, in a heavily mutated form known as Metal Overlord, achieved by copying the data of Sonic, Shadow, and Chaos. Once defeated he returns to his original form and is knocked out.

Though it is implied that he is taken by Shadow and Omega, he is later reprogrammed by Eggman to serve him again, although he betrays him again in Sonic Free Riders. In Sonic Rivals 2, he becomes more of an anti-hero fighting alongside Shadow against Eggman Nega, although this is because he is working for Eggman again and Eggman is also against Eggman Nega.

In Sonic Generations, Metal Sonic is the first boss. 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. 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. Oddly enough, he can still be found in the Hub World and re-challenged (much like every stage and boss in the game).

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.

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 third robotic version of Sonic, and has appeared in many games (whereas Mecha Sonic and Silver Sonic are destroyed in the first games they appear in).