Spoilers Alert: This article contains potential spoilers for Sonic the Hedgehog 3!Sonic the Hedgehog 3 brought the popular character Shadow to the big screen, but the question of where exactly the mysterious hedgehog came from remains. The third installment in the Sonic film franchise introduces Shadow the Hedgehog (Keanu Reeves), two years after his brief appearance at the end of Sonic 2, and he serves as the antagonist against Sonic (Ben Schwartz), Tails (Colleen O’Shaughnessey), and Knuckles (Idris Elba). Throughout the movie, Shadow works alongside both Gerald and Ivo Robotnik, played by Jim Carrey in dual roles, to obtain the necessary equipment required to activate the Eclipse Cannon and obliterate Earth.

https://screenrant.com/sonic-the-hedgehog-3-shadow-asteroid-where-from/