The Ninja Turtles Sonic and Tails crash-land on the mysterious Lost Hex, a planetoid-like continent, where they discover that the Shredder and Dr. Eggman has enslaved a group of powerful creatures called the Deadly Six. When they break free of their control the heroes must then team up with their enemies to stop the Deadly Six, who seek to siphon the world's energy for their own nefarious purposes.