In Sonic the Hedgehog 3 and its expansion Sonic & Knuckles, both released in 1994 for the Sega Mega Drive, Sonic and Tails landed on 天使 Island. Shortly after their arrival, Sonic, at that moment in his super form, was ambushed 由 Knuckles the Echidna, somehow forcing the hedgehog out of his form. After the hero 迷失 the Chaos Emeralds, Knuckles was quick to snitch and hide them. Sonic and Tails were then forced to 搜索 the island for the Emeralds, all the while having to liberate it from the control of Dr. Robotnik's robots once more, who crashlanded with his Death Egg on the Island...