Before South Island

Before the events of Sonic: South Island, the island was very peaceful (as we see before Robotnik's Attack in Sonic: South Island Chapter 1). A few weeks prior to the attack by the mad scientist, Robotnik. Sonic The Hedgehog had crashed his plane, The Tornado. Not long after, the villagers of The Green Hill Village, discovered the crashed plane and found Sonic The Hedgehog, who fortunately wasn't hurt by the crash. Soon after, the villagers gave Sonic a place to live, and after growing comfortable with South Island, Sonic began to impress The Village Elder, and the old bear offered the role of Freedom Fighter. Sonic didn't have a home, but he finally had one, So he accepted! And soon after, well, you know the rest (: