3D Orbital Combat Shooter playing in the NAG universe. You control an orbital combat drone (OCD) whose mission it is to guard and protect your mothership or space station against hordes of alien intruders and space parasites. Attack wave after attack wave they are coming for your mothership. You encounter impressive planetary or outer space environments facing various types of enemies like the Vampire or the Remote Killer. Use weapons like Dual Phaser Guns or Plasma Throwers to eliminate them as quick as possible... before they eliminate you.