‘Sonic the Hedgehog 3’ stars Jim Carrey, Ben Schwartz, James Marsden, Tika Sumpter, Idris Elba, Colleen O’Shaughnessey, Natasha Rothwell, Shemar Moore, Keanu Reeves and more. In this installment, Sonic, Knuckles and Tails join forces to take down super villain Shadow and protect the planet. ‘Sonic the Hedgehog 3’ hits theaters on Dec. 20.