Sonic the Hedgehog 3 introduced Metal Sonic in a credits scene to set up the character as a Sonic 4 villain, but it created a major problem.

With new characters and the fact that this franchise keeps getting better with each installment, Sonic the Hedgehog 4 will ...

In this respect, it looks like the fourquel’s antagonist may be the Metal Sonics, and the movie could follow Team Sonic’s battle against a robotic army. But Sonic shouldn't worry as it looks ...