Sega has announced today that Episode Metal, a special unlockable story, will be available to those who have already downloaded both Sonic the Hedgehog 4 Episode I and Sonic the Hedgehog 4 Episode II on the same platform, including iOS. In the forthcoming extra episode, fans get to experience a new adventure that bridges the gap between Sonic CD and Sonic the Hedgehog 4 Episode II. The player gets the chance to take control of Sonic’s greatest rival, Metal Sonic, across four reworked Acts from Episode I, as the metallic one rebuilds himself to challenge Sonic once again in Episode II. The game will be available for iOS this May. As you can see from the trailer above, the new installment is looking gorgeous as always. If you want to find out more about the game, you can follow SEGA on Twitter at @SEGA, or “like” the Facebook page.