Sonic 3 features a lot of characters. We're talking major parts for Sonic, Tails, Knuckles, Tom, Maddie, and Agent Stone; the introduction of Keanu Reeves' Shadow and Krysten Ritter's Director Rockwell; and appearances from three members of the Robotnik clan (Eggman, Gerald, and Maria).
Still, director Jeff Fowler goes one step further and introduces a few more key characters in the first Sonic the Hedgehog 3 post-credits scene. Indeed, the moment serves a similar purpose to the second Sonic movie's post-credits, bringing famous characters from the games to the big screen for the first time.
