After having a smaller role in the acclaimed third film, Knuckles could potentially lead his own team in the upcoming Sonic ...

However, he would "consider" coming back for Sonic 4, so this might not be the last we see of Eggman. Spoilers for Sonic the ...

Another still shows Metal Sonic standing next to Emperor Eggman – could this be explored in Sonic 4? It's certainly possible, and follows the recent trend of Sonic movies being inspired by its ...