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.

Väike sinine superenergiapall Sonic satub maale, sest peab oma planeedi päästmiseks peidus elama. Tema kõige tähtsam ülesanne on mitte äratada tähelepanu. Kuid sellist supervõimet nagu Sonicul, on võimatu kaua varjata, eriti kui sa oled ülienergiline ja vallatu teismeline, kes üldse ei armasta üksildust.

Sonic, Tails, and Knuckles encounter an abandoned Badnik drone which upgraded itself using parts from a junkyard, with the intention of conquering the world.

While escorting Dr. Eggman and his hapless new helper Trip through a perilous ruin, Fang the Hunter will need to muster all his cunning to overcome past mistakes and escape the coils of a fierce new enemy. Meanwhile, Eggman discovers what may be the key to his next dastardly scheme.

Based on the well-known video game.