Snorflag of Lavaton, Kutterwood of Ungle, Glayciar of Eyce, Shatter of Krystal, Warter of Layquid and Lology of Fless have been recaptured, however four more alien criminals are still on the loose. Mach's prison ship is ready to fly once again, and the Guard Robot gives Conner and Elise the chance to see the Earth from space. While they fly around, Gass of Vaypoor is busy trying to sell our home-world to an alien civilisation. If she finds a buyer, what will happen to us? The Alien Hunters need to stop this devious con-trick. The Earth is not for sale!