Robotnik's plans for world domination, release the animals Dr. The game's story focuses on Sonic's efforts to stop Dr. First released in North America, Europe, and Australia on June 23, 1991, the game is the first installment in the Sonic the Hedgehog series, chronicling the adventures of the titular character in his quest to defeat the series' antagonist Dr. Sonic the Hedgehog is a platform video game developed by Sonic Team and published by Sega for the Sega Mega Drive/Genesis. This game can be played also in a versions for NES, SMS and Game Gear.
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