Sonic the Hedgehog is a character in the Sonic the Hedgehog series. He first appeared in Rad Mobile. He is a fast hedgehog that is Sega's mascot. He can also roll up into a ball and Spin Dash to go even faster. He has done everything from saving animals to saving the world. Some of his allies are Miles 'Tails' Prowler, Knuckles the Echidna, and Amy Rose. Some of his rivals are Dr. Eggman, Shadow the Hedgehog, and Rouge the Bat.