Great Ones Tymos and Kryslie know that the Genesis 1 deep space mission is vital to Earth's future, so when Ciriot pirates capture the Earth ship, they act. However, the pirates have discovered Earth's location, seeing it as a planet ripe for exploitation. At first they act covertly, infecting humans with control devices, making them unwitting traitors. When they invade in force, the Great Ones must reveal themselves do that Earth can gain vital help...