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After Sonic and Tails defeat Dr. Robotnik in Sonic the Hedgehog 2, Robotnik's space station, the Death Egg, crash-lands on the floating Angel Island. The impact from the Death Egg's crash causes the island to fall into the ocean. There, Robotnik meets Knuckles the Echidna, the last member of an ancient echidna civilization that once inhabited the island. Knuckles is the guardian of the Master Emerald, which grants the island its levitation power and has an equal power level of the 7 Chaos Emeralds.[17] Robotnik dupes Knuckles into believing Sonic is trying to steal the Master Emerald, and that the launch base is Sonic's base, turning the two against each other while he repairs the Death Egg.[18]
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