Two of film's most deadly monsters collide when Aliens take on Predators in ALIEN VS PREDATOR and its sequel ALIENS VS PREDATOR - REQUIEM.
In ALIEN VS PREDATOR, a group of archaeologists find themselves fighting for survival when they discover a number of aliens buried in the ice. Their survival rate is hampered further by the arrival of more aliens on a training mission.
In ALIENS VS PREDATOR - REQUIEM, a Predator on a homebound spacecraft has a baby alien/Predator hybrid burst from his chest, causing the ship to crash in the Colorado woods. Several facehugger specimens escape, planting eggs down the throats of a hunter and his son. The dead Predator's home planet receives a transmission of the alien outbreak, and a fellow denizen of his world is dispatched to clean up the multiplying aliens.