This includes two pieces that depict the characters introduced in the post-credits scene: Amy Rose and Metal Sonic. The art of Amy closely resembles her introduction in the final movie.

while Amy’s introduction remains largely the same—rescuing Sonic from a Metal Sonic army—the art adds a distinctly post-apocalyptic tone, hinting at a darker tone which, if we're honest ...

The concept art aligns with the Sonic 3 post-credits scene, which introduced Metal Sonic as an antagonist and Amy Rose as an ally. The scene showed Sonic cornered by an army of Metal Sonics ...