Clash of the Elements Part 4: Messenger from Nega

With the events of his training behind him, Riku now travels forth to the world of Sonic the Hedgehog and friends. But now that Eggman has returned from the aftermath of Sonic Generations he has whipped up a scheme that will surely test the limits of the blue hedgehog's capabilities. The time has come for the Elemental Overlord's training to be put to good use, or all will be lost.