Sonic and Tails team up with Knuckles and the Chaotix against Robotnik's most terrifying weapon to date--a doomsday machine that could roboticize the entire planet with just the push of a button... the Death Egg. The massive space station looms over Mobius, threatening to turn every living creature into mindless drones. Can our way-past-cool blue hero and his heroic friends defeat Robotnik and destroy this ultimate weapon before it's too late? And...