Sonic 2 Is Already Teasing Metal Sonic For Robotnik's Endgame

Metal Sonic could be Sonic 3

Sonic the Hedgehog 2 – Trailer Breakdown and Easter Eggs Analysis

Archie Sonic Main Discussion - Page 1263 - Comics - Sonic Stadium

The rumoured Sonic 2 Post Credits Scene has been leaked (MASSIVE SPOILERS for the ending of Sonic 2), Page 6

sonic underground – CrystalMaiden77

Sonic the Hedgehog - Sonic Retro

Retrospective: Sonic Adventure - Fextralife

Sonic the Hedgehog (Archie Comics) (Comic Book) - TV Tropes

Which one of these character teases are you most hoping to see in the mid/post credits scene of the Sonic the Hedgehog 2 Movie? : r/SonicTheHedgehog

Sonic The Hedgehog Posters Released

Reviews on Sonic-Fanfic-Writers - DeviantArt

Knuckles the Echidna/History and appearances

Dr. Robotnik (Character) - Comic Vine

Hedgehogs Can't Swim: September 2016

Will Dr. Robotnik build Metal Sonic in Sonic the Hedgehog 2?