After settling in Green Hills, Sonic is eager to prove he has what it takes to be a true hero. His test comes when Dr. Robotnik returns, this time with a new partner, Knuckles, in search for an emerald that has the power to destroy civilizations. Sonic teams up with his own sidekick, Tails, and together they embark on a globe-trotting journey to find the emerald before it falls into the wrong hands.
Knuckles embarks on a hilarious and action-packed journey of self-discovery as he agrees to train Wade as his protégé and teach him the ways of the Echidna warrior.
Sonic, Tails, and Knuckles encounter an abandoned Badnik drone which upgraded itself using parts from a junkyard, with the intention of conquering the world.
