Once settled in Green Hills, Sonic is determined to prove that he has the temperament of a hero. He is put to the test as Dr. Robotnik reappears, this time with a new partner, Knuckles, looking for an emerald that would have the power to destroy entire civilizations. And here’s Sonic alongside his own sidekick, Tails, who venture on a globetrotter mission to find the emerald before it falls into the wrong hands.