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) positively received by journalists. A second demo was released in late 2017, which "Eurogamer" called ambitious. Sonic the Hedgehog (2006 video game) Development began in 2004, led by "Sonic" co-creator Yuji Naka. Sonic Team sought to create an appealing game in the vein of superhero films like "Batman Begins", hoping it would advance the series with a realistic tone and multiple gameplay styles. Problems developed after Naka resigned to form his own company, Prope. The team split to work on the Wii game "Sonic and the Secret Rings" (2007), resulting in "Sonic the Hedgehog" being rushed for the holiday season.