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 4: Episode I Sonic the Hedgehog 4: Episode I "Episode I" was released in October 2010 for iOS, PlayStation Network, WiiWare and Xbox Live Arcade. A release for Windows Phone 7 followed in June 2011, for PC (via Steam) and Android in January 2012, for BlackBerry PlayBook in July 2012, and for Ouya in July 2013. A direct follow-up, "", was released in 2012. "Sonic the Hedgehog 4: Episode I" is a 2D side-scrolling platformer reminiscent of the original "Sonic" games for the Sega Mega Drive/Genesis. Players control Sonic the Hedgehog, using mechanics such as the original Spin Dash and power-ups such as