 Sonic the Hedgehog and his friend Tails pursue Doctor Eggman , who has captured several of their animal friends with the intention of using them to power his robot army . While the two attempt to retrieve a falling capsule filled with animals , Eggman shoots down Tails ' plane . However , they end up discovering a world in the sky known as the Lost Hex , and crash land there . Entering the Windy Hill Zone , Sonic and Tails make their way through clouds and the grassy fields . The duo then discover that Eggman has enlisted the aid of a group of the world 's indigenous Zeti race , collectively known as the Deadly Six , using a magical conch to keep them under his command . However , when Sonic rushes in and kicks the conch away , the Deadly Six betray Eggman and take control of his Badnik army . They then start to use one of Eggman 's machines to siphon energy from Sonic 's world below , planning to drain all of its life force until there is nothing left and use it to power themselves up . Reluctantly , Sonic agrees to work with Eggman , believing that he needs his help to stop the machine , though this seems to cause some distrust between him and Tails . 
