Not long after military forces from Earth, thinking they've defeated an alien Bug infestation on Pluto, the insects return and threaten our scientific outposts. Mobile Infantry forces are sent back to Pluto forwhat is believed to be a little mop-up mission. Rookie Troopers Johnny Rico, Dizzy Flores and Carl Jenkins make their first military drop with "Razak's Roughnecks," an M.I. squad let by Lt. Razak, a legendary soldier known for his heroism. Shortly after they arrive, the Roughnecks discover that this is not just a simple "hit and run" mission ... but the first battle of what's to become the First Interstellar War.