Sonic, Knuckles and Tails reunite to battle Shadow, a mysterious new enemy with powers unlike anything they've faced before. With their abilities outmatched in every way, they seek out an unlikely alliance to stop Shadow and protect the planet.

The latest installment in the franchise introduces Keanu Reeves as popular video game character Shadow, alongside returning cast members Jim Carrey, Idris Elba, Ben Schwartz, and James Marsden.