video game mainstay Colleen O’Shaughnessey) and the sinister Knuckles (voiced by Idris Elba) are joining Sonic (once again voiced by Ben Schwartz) for more over-the-top mayhem. If you’ve ever plopped yourself down in front of a Sega Genesis, the memories will come flooding back.But what will the next installment bring?Well, a clue is revealed during the “Sonic 2” credits sequence (mercifully you don’t have to wait until the very end of the credits) that points towards what the inevitable “Sonic the Hedgehog 3” will bring us in the not-too-distant future.Major spoilers for “Sonic the Hedgehog 2” follow.Sure, Tails and Knuckles are two huge additions to the Sonic cinematic adaptation, but there was even more for fans to eat up in “Sonic the Hedgehog 2.” For one thing, the main plot centers around Knuckles and Dr.