After a year long break against the evil forces of Eggman, Sonic and his friends re-center and enjoy life without his schemes. Not happy to leave this world unconquered, Eggman returns with his final plan to end the resistance on Earth's islands once and for all. Gleaning from the technology of the Ancients and what he's learned through his Starfall Island defeat, he has created the ultimate weapon that will stop Sonic in his tracks, one that highjacks the Blue Blur's own quick mind. Look from the unique viewpoints of the entire team as Sonic, Tails, Amy, Knuckles, Shadow, and a new mechanical friend all tell their individual stories and work together to overcome Robotnik's deadliest threat yet: The Adumbration Chair