Scooby Doo & The Mystery of the Chaos Emeralds!

Revolta is gone... Or so it seems, when the seven chaos emeralds are somehow drained of their power, Sonic and his friends must come to the rescue to restore them! But they can't do it alone, they're going to need help from a few meddling kids, monsters, cadets, a energetic pup and one extraordinary dog... But someone's watching them and he's someone Sonic thought he forgot!