Hot on the heels of yesterday's official announcement, Sega has released the first trailer for Sonic Generations. It shows off an area that looks quite a bit like the classic Green Hill Zone, being played in both its 2D and 3D incarnations.
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The game is Sega's way of celebrating the hedgehog's 20th anniversary, by bringing the old-school "Chubby" Sonic back alongside the modern 'Jenny Craig' Sonic. The two are brought together by a time portal, which serves as the basis for revisiting classic characters and stages in both 2D and 3D. The game is due this holiday season on PlayStation 3 and Xbox 360.