Maybe she's been secretly harboring a crush… Who is Metal Sonic? And what is The Brotherhood of Metallix? We also see Metal Sonic in the post-credits scene. The character was also introduced in ...

But it's worth noting that in the comic book series Sonic the Comic, released between 1993 and 2002, there are multiple Metal Sonics, known as Metallix. In fact, they form The Brotherhood of Metallix.