Metal Sonic (メタルソニック Metaru Sonikku?) is a character that appears in the Sonic the Hedgehog series. He is a Badnik created by Dr. Eggman, modeled after Sonic the Hedgehog. Metal Sonic can imitate Sonic's abilities and achieve speeds matching his own. Widely regarded as one of Dr. Eggman's greatest creations, Metal has been shown to wipe out his foes in seconds and can even take on many of them at a time.

While usually serving as Dr. Eggman's obedient and silent enforcer, Metal Sonic is an intelligent robot with a very dark side. Cold-hearted and ruthless, he is obsessed with proving his superiority to Sonic and eliminating him for good to the point where he has rebelled against Dr. Eggman more than once to achieve his goal. However, he always fails in the end, only to later return more powerful than before. To this day, Metal Sonic remains one of Sonic's most dangerous foes.

I WILL BATTLE YOU AS MANY TIMES AS IT IS NECESSARY.
— Metal Sonic, Sonic Generations (console/PC)