The Starion cluster is threatened by the Pioneer Plague, which is spreading throughout the planets and destroying their life forms, having overridden its original programming to merely transform uninhabitable planets into lush green lands for human colonization. The only solution is to fly to each of these planets and shoot the pods from which the Plague emerges.
The game has essentially 3 different sections. The main shooting action consists of eliminating as many pods as possible, while avoiding being shot at by the Plague's auto-generated protection robots. The more pods you destroy in each level, the easier the next ones will be.
Before each level you must fly to it through a mouse-controlled 3D section - completing the task quickly will again make it easier for you. A unique feature is the ability to program the attack trajectories that your ship's two probes will follow when deployed - this is done by moving the joystick in the appropriate set of directions, producing five options that can be activated in the game.
