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The movie kicks off on the Mushroom Planet, where Dr. Eggman, also known as Robotnik, has been stranded for 243 days. After relentless effort, he creates a machine to return to his world. However, his plans go awry as an explosion sends him spiraling. A portal opens, and Eggman is rescued by a group of soldiers, only to awaken and thwart them with his cunning traps. Upon encountering Knuckles, who is searching for Sonic's quill, the two form an alliance aimed at hunting down the Master Emerald.