Metal Sonic (メタル・ソニックMetaru Sonikku?) is an evil robotic version of Sonic created by Dr. Eggman. He first appears in Sonic the Hedgehog CD. He is given orders to go back in time and change the past so that Dr. Eggman can rule the future. Sonic must race him in Stardust Speedway to free Amy Rose. He returns in Knuckles' Chaotix, where he attempts to obtain the Chaos Rings, but he is stopped by the Chaotix. He was a playable fighter in Sonic the Fighters, and most notably the main antagonist in Sonic Heroes. InSonic Generations, he appear in his classic form as a rival boss, and he is destroyed when Classic Sonic kicks him into the air. Metal Sonic also appeared as a playable character in the multiplayer version of Sonic Adventure 2: Battle, also in Mario & Sonic at the Olympic Winter Games, Mario & Sonic at the London 2012 Olympic Games and Sonic the Hedgehog 4.
He possesses a laser cannon built into his abdomen and a force field device. He usually only communicates with a series of electronic noises. The only time Metal Sonic was able to talk was in Sonic Heroes while in his Neo form.