Mateo is a completely normal boy who one night realizes that he must assert himself as the defender of dreams against the Nightmare King and his nasty machinations. But are his dreams really just dreams? Because in the morning, creatures from Mateo's dream are suddenly reality and a lot else has changed.

When an explosive battle with Dr. Eggman shatters the universe, Sonic races through parallel dimensions to reconnect with his friends and save the world.