Sonic 3 Concept Art Hints at Possible Sonic 4 Plot Directions

Newly surfaced concept art suggests potential storylines for Sonic 4, including the return of Metal Sonic and a time-travel element.

Concept art from Sonic 3, released by Tacit Sign Studio, includes scenes that were cut or altered in the final film.
One image shows Metal Sonic alongside an Emperor-like Eggman in a post-apocalyptic setting, which was not included in Sonic 3.
The art hints at a possible time-travel storyline for Sonic 4, potentially inspired by the 1993 game Sonic CD.
Amy Rose and Metal Sonic, both introduced in Sonic 3’s post-credits scene, are speculated to play key roles in the next installment.
The quick removal of the concept art from public view has fueled fan speculation about its connection to Sonic 4.