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) band Zebrahead. Crush 40 performed Shadow's theme, "All Hail Shadow", while vocalist Lee Brotherton sang Silver's theme, "Dreams of an Absolution". R&B artist Akon performed a remix of the Dreams Come True song "Sweet Sweet Sweet", a song previously used as the ending theme to "Sonic the Hedgehog 2" (1992). Because it was the first "Sonic" game for seventh generation consoles, Ohtani "aimed to emphasise that it was a epic next-generation title." Two soundtrack albums were released on January 10, 2007, under Sega's Wave Master label: "Sonic the Hedgehog Vocal Traxx: Several Wills" and "Sonic the Hedgehog Original Soundtrack". "Vocal