Sonic the Hedgehog 2's post-credit scene cameo, explained - Polygon

Wondering who the character is in the post-credits scene of Sonic 2, or who’s going to replace Dr. Robotnik if Jim Carrey does retire from acting? The brief end-credits appearance of Shadow the Hedgehog sets up a conflict for Sonic 3. Here’s what we know about Shadow’s history in the games, and what’s coming up in the third movie.

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