Sonic's director has taken requests to add Silver to the movies into consideration, and concept art hints he was almost in Sonic 3.

Though the depicted scene didn’t appear in the final movie, it may give us clues about a new character's origins

New Sonic 3 concept art has emerged and has swiftly been taken down, but not before fans received a peek at a cut Metal Sonic and Eggman moment that may reveal where the franchise is heading next in Sonic 4.