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.

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 ...

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