Sonic 4 is already in the works ... Sonic may hint at the series closing in on Sonic CD territory. In the 1993 title, Sonic raced through various points in time to stop a 'bad future' ruled ...

Sonic the Hedgehog 4 is introducing Metal Sonic as its next big villain, but Knuckles' TV show proved it also has the perfect antagonist for Shadow.

In the 1993 title, Sonic raced through various points in time to stop a 'bad future' ruled over by Eggman and his heavy, Metal Sonic. Sonic 4 cast: predicted returning characters Much like the ...