While engaging in a fight with his nemesis, Dr. Eggman, Sonic the Hedgehog destroys the Paradox Prism, an ancient artifact with immense power. This causes a ripple in the space-time continuum, separating Sonic from his friends and sending him to New Yoke City, a dystopian version of Green Hills in a parallel universe ruled by five Eggman variants. Traveling through his new surroundings, Sonic is confronted by Nine, a variant of his best friend Tails who constructed mechanized tails as weapons against his childhood bullies, not having a Sonic to help him. Sonic earns ...