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.

Based on how Knuckles and Shadow were treated in previous movies, I worry Tails is yet to take another backseat in favor of further exploring Amy Rose and Metal Sonic in Sonic the Hedgehog 4.

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Metal Sonic. Of course, it will be no surprise to see Schwartz return as Sonic – how would there be a Sonic movie without him? The same goes for Sonic's best friends Tails and Knuckles ...