Sonic: Metallix Unleashed (169361) : BlazingZtar755 : Free Download, Borrow, and Streaming : Internet Archive

A Sonic the Hedgehog fan comic which features Metal Sonic as the primary antagonist. Credit for sprites where it is due. May feel somewhat generic.

Metallix, Legends of the Multi Universe Wiki

Metal Sonic in Sonic the Hedgehog 2 1.1 : Free Download, Borrow, and Streaming : Internet Archive

Brotherhood of Metallix by RandomoTheRandom2 on DeviantArt

Brotherhood of Metallix by Nictrain123 on DeviantArt

Metallix, Videogaming Wiki

Sonic 1 Metallix : Free Download, Borrow, and Streaming : Internet Archive

Sheri Groleau - Metallix

Sonic X : Free Download, Borrow, and Streaming : Internet Archive

Metal Sonic in Sonic the Hedgehog 2 1.1 : Free Download, Borrow, and Streaming : Internet Archive

Metal Sonic in Sonic the Hedgehog : Lone Devil : Free Download, Borrow, and Streaming : Internet Archive

Sonic and Eggman (7671) : Darkblade128 : Free Download, Borrow, and Streaming : Internet Archive