After the disappearance of his greatest asset, Infinite, Dr. Robotnik has used his research of the Phantom Ruby to unknowingly create a portal to another universe! Out from that portal came the pseudo version of our hedgehog hero: Scourge the Hedgehog. Scourge and his team are the moral opposite of Sonic, who stands for freedom and peace while Socurge thrives for destruction and chaos. He and his team wreak havoc upon Mobius in partnership with Eggman, in the doctor's hopes of finally conquering the planet. Sonic dealt with copies of him before, but not one as rude, as merciless, or as ruthless as Scourge. Now everyone's copies are up against each other in this epic clash of two worlds. Which one will survive?
