Alien: Enemy of My Enemy

Hygieia, an outer rim colony, is doomed as the 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 accusing finger 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. The only hope for peace may lie with the deadliest ally imaginable...