Sonic the Hedgehog is a video game franchise created and produced by Sega. The franchise centers on a series of speed-based platform games. Sonic, the protagonist, is an anthropomorphic blue hedgehog with supersonic speed, capable of reaching the speed of sound. Typically, Sonic—usually along with some of his friends, such as Tails, Amy, and Knuckles—must stop antagonist Doctor Eggman's plans for world domination.
The first game in the series, released in 1991, was conceived by Sega's Sonic Team division after Sega requested a mascot character. Its success spawned many sequels and helped Sega become...