Mecha Sonic MKI and MKII, Metal Sonic Wiki

Mecha Sonic was to have a number of models appearing in Sonic X-Treme, which were never finalized. These two models were refered to as Mark I and Mark II

Mecha Sonic Mk. II VS Battles+BreezeWiki

Notable Fan Works/Silver Sonic Mech, Metal Sonic Wiki

Mecha Sonic Mkii Wiki

So, what's the deal with Mecha Sonic in terms of the Classic

Sonic the Hedgehog CD (Video Game) - TV Tropes

Mecha Sonic Series by FlameHog419 on DeviantArt

Mecha Sonic Mk. II, Villains Wiki

Sonic Superstars Digital Deluxe To Include Prototype Rabbit Skin

Mecha Sonic Battles