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Sonic the Hedgehog is a video game franchise that began in 1991. The series centers on Sonic, an anthropomorphic blue hedgehog who runs at high speeds and collects golden rings. To stop the evil Dr. Eggman (aka Dr. Robotnik) from taking over the world, Sonic teams up with his friends, Tails, Knuckles, Amy, and others, to defeat Eggman's robots and creatures. Each character has a unique personality and abilities that help them contribute to the story.