Sonic and his friends were on a mission to stop the evil Dr. Eggman from taking the power of a mysterious island. However, during the fight, Eggman accidentally hit something with his weapon. Suddenly, a portal appeared and sucked everyone in.

Sonic woke up in a corrupted version of Green Hills, a place he once knew as home. Now it was a dark, twisted version of what it used to be. The beautiful green landscapes were now covered in darkness and corruption.

Determined to find his friends and return home, Sonic began his journey. After some time, he found his friends and Dr. Eggman. As he tried to talk to them, they were suddenly attacked by their corrupt counterparts.

With no choice, they all had to escape. Sonic and his friends continued their journey and found the rest of their group battling the corrupted counterparts. Despite the odds, they managed to save them.

With everyone banded together, they found a lab. But as they entered, they were ambushed by Sonic.EXE. He was the one who possessed this world's Sonic, corrupted his friends, and the world.

Just as they thought they were done for, a survivor saved them and helped them escape. Her name was Evelyn, a brave and intelligent mouse. She told them that the only way to save their world was to gather the seven energy emeralds.

Following Evelyn's guidance, they managed to find six of the energy emeralds. But as they reached the location of the seventh, Sonic.EXE was waiting for them. The final fight began.

Suddenly, a portal to their world opened and Sonic.EXE entered their world. Sonic got the seventh emerald, but the island was corrupted by Sonic.EXE's power.

Everyone, including Dr. Eggman, decided to help. They used the energy emeralds to power Evelyn's blaster. With a powerful blast, Sonic.EXE was defeated, freeing the Sonic he had possessed, his friends, and the world.

Evelyn thanked them for their bravery and wished them well as they returned to their world. Dr. Eggman, however, slipped away, promising to cause trouble another time. And so ended Sonic's corrupted adventure.