Sonic the Hedgehog protagonist Sonic the Hedgehog, a blue hedgehog able to run at supersonic speeds, and recurring villain Dr. Eggman, an evil scientist whose ambition is to conquer the world. Among Sonic's many allies, the most well-known include: Miles "Tails" Prower, a twin-tailed, highly intelligent yellow fox who is Sonic's sidekick and best friend; Amy Rose, a pink hedgehog who is Sonic's self-proclaimed girlfriend and a hero in her own right; Knuckles the Echidna, a coolheaded red echidna who is the guardian of the Master Emerald; Shadow the Hedgehog, an anti-heroic doppelgänger of Sonic with a dark past; and Metal Sonic, a
Sonic the Hedgehog (2006 video game) worst video games of all time. The game remains popular for "Let's Play" walkthroughs, with players showing off its glitches. The official "Sonic" Twitter account also mocks the game. The failure of "Sonic the Hedgehog" led to the direction of the series being rethought. The next main "Sonic" game, 2008's "Unleashed", ignored the gritty and realistic tone of its predecessor. With "Unleashed"'s sequel "Sonic Colors" (2010), "The A.V. Club" wrote, "the series rediscovered its strength for whimsical tales with light tones." "Sonic the Hedgehog" introduced Silver the Hedgehog, Princess Elise, Mephiles, and Iblis to the franchise; most have made few