In the past, Eggman met Sonic and the two immediately became enemies, having fought many battles with each other, with the hedgehog inevitably prevailing in the aftermath.[10][11] Some of Eggman's plots have included trying to take ownership of the Chaos Emeralds (multiple times no less) and attempting a plot involving the Death Egg. Each time however, Sonic stopped him.[12] At one point, the doctor would attempt to conquer Flicky Island, but his schemes were thwarted.[13][14] Another plot of the villain's involved the deployment of the Hard Boiled Heavies against Sonic, which also failed.[15][16]