While a moon hurtles toward certain destruction, taking with it a Weyland-Yutani bioweapons lab, talks on a nearby colony could lead to all-out war among the colonies. HYGIEIA-AN OUTER RIM COLONY-IS DOOMEDThe moon on which it was built hurtles toward an inevitable collision with the dead planet Hephaestus.

The clock is ticking, yet when a distress signal arrives from a Weyland-Yutani biowarfare outpost, a desperate plan is launched to evacuate the trapped scientists.

Meanwhile, across the galaxy a mysterious black substance rains down on Earth settlements, creating hideous monsters from indigenous creatures... and from human beings. Terran governments point the accusingfinger at one another.Thus on LV-846-a United Americas colony-high-level talks convene to address the galaxy-wide hostilities, but there's a plot brewing among the participants.

One which could plunge the colonies into all-out war.