Metal Sonic 

A deadly, Robotic incarnation of Sonic the Hedgehog with Terminator-like Powers. He speaks in a Monotonous voice that suits his wicked personality, and can summon the Black Shield: a dark diamond that protects him from all attacks, but limits his movements.

It is also believed by some that he is in love with Amy Rose.

Metal Sonic is the definition of Kick-Ass. Amy just hasn't learned to appreciate him......yet. >:D

Metal Sonic by Shirubi Shirumanu September 11, 2004

Metal Sonic 

The greatest enemy I've ever seen since.. Ever. Robots are so cool, Sonic isn't, so if you put them together, you get the most awesome thing ever. Metal Sonic could kick your ass, your mom's ass, and even his own if he wanted to.

Sonic hasn't defeated Metal Sonic so far, but will he ever...?

No. No he won't.

Metal Sonic by Kooper113 August 28, 2004

Metal Sonic 

Robotic antagonist in the Sonic games/shows/comics. He was allegedly created to fight Sonic in "Sonic the Hedgehog 2" after Robotnik was thwarted in the first game, and he also appeared in Sonic and Knuckles. Since then, he has appeared in several games, both as bosses, cameos, easter eggs, and characters. Metal Sonic has been caled Mecha Sonic

Metal Sonic was a villian in Sonic the Hedgehog 3

Metal Sonic by KazooieBanjo November 20, 2007