Sonic the Hedgehog (Japanese: ソニック・ザ・ヘッジホッグ, Sonikku za Hejjihoggu?) is a video game character and the main protagonist of a video game series made by SEGA, as well as numerous spin-off comics, television series and books. The first game in the franchise was released on June 23, 1991 in order to provide SEGA with a mascot to rival Nintendo's flagship character Mario. Since then, Sonic has become one of the world's most well-known video game characters, with his series having sold over 45 million copies. In 2005, Sonic was one of the first game character inductees into the Walk of Game, alongside Mario and Link.

Artist Naoto Ōshima, designer Hirokazu Yasuhara and programmer Yuji Naka are generally credited with the creation of the character, a blue, anthropomorphic hedgehog, whose ability to run at supersonic speeds is a major part of the gameplay of the series.

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  • In the animated television series The Adventures of Sonic The Hedgehog, a villain named Scratch was a robotic chicken.