After Sonic defeats Dr. Robotnik at the end of Sonic the Hedgehog 2, his space station, the Death Egg, crash-lands on a mystical floating landmass called Angel Island (or simply "the Floating Island" as it's called in the game manual). As Dr. Robotnik begins to repair the damaged station, he meets up with Knuckles the Echidna, the last surviving member of an ancient civilization of Echidnas that once inhabited the island. He is also the guardian of the Master Emerald, which grants the island its levitation powers.
Knowing Sonic and Tails will try to track him down, and realizing he can use the Master Emerald to power the ship, Dr. Robotnik dupes Knuckles into believing Sonic is trying to steal his Emerald. Shortly after, Sonic and Tails in their biplane, the Tornado, are in search of Dr. Robotnik. Sonic, possessing the emeralds from the events of Sonic 2, then turns into Super Sonic. As soon as they arrive, Knuckles ambushes Sonic from underground and knocks the Chaos Emer...
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