In present day Washington D.C., FBI HQ, two agents named Scolder and Mully are interrogating a mysterious woman named Particle who was found in the ruins of Lucus Air Force Base earlier. She tells them that she was sent into another dimension to retrieve a large power source from somewhere. Upon entering that new dimension, she runs into Sonic the Hedgehog, Tails, Sally Acorn, Bunnie Rabbot, Antoine, and Rotor who are busy searching the ruins of the once great Robotropolis. Using her powers, she knocks them out and teleports to Angel Island where she finds the Master Emerald (with Mammoth Mogul still trapped inside) and Knuckles the Echidna guarding it. She tricks him, knocks him out, and then steals the Master Emerald, leaving the island to fall into the sea. After finishing her story, Pa