Alien vs. Predator (stylized as AVP: Alien vs. Predator) is a 2004 science fiction action film written and directed by Paul W. S. Anderson, and starring Sanaa Lathan, Raoul Bova, Lance Henriksen, Ewen Bremner, Colin Salmon, and Tommy Flanagan. It is the first film installment of the Alien vs. Predator franchise, adapting a crossover bringing together the eponymous creatures of the Alien and Predator series, a concept which originated in a 1989 comic book written by Randy Stradley and Chris Warner. Anderson wrote the story, with the creators of the Alien franchise, Dan O'Bannon and Ronald Shusett receiving additional story credit due to the incorporation of elements from the Alien series, and Anderson and Shane Salerno adapted the story into a screenplay. Their writing was influenced by Aztec mythology, the comic book series, and the writings of Erich von Däniken. In the film, scientists are caught in the crossfire of an ancient battle between Aliens and Predators as they attempt to escape a bygone pyramid.

DETAILED PLOT

In 2004, a Predator ship arrives on Earth and uses a heating device to melt a hole in Antarctic ice. Meanwhile, a satellite detects the heat bloom beneath Bouvetøya, an island about 1,000 mi (1,600 km) off the coast of Antarctica. Wealthy industrialist Charles Weyland discovers through thermal imaging that there is a pyramid buried 2,000 ft (610 m) beneath the ice. He assembles a team of experts to investigate, including archaeologists, linguists, mercenaries, and a mountaineering guide named Lex Woods. Terminally ill, Weyland desires to claim the discovery in his name.

When the team arrives at the abandoned whaling station, they find a newly made tunnel running directly beneath the ice toward the pyramid. The team descends the tunnel and begins to explore the pyramid, soon finding evidence of an ancient civilization and what appears to be a sacrificial chamber filled with human skeletons that all have ruptured rib cages.

Meanwhile, three Predators ⁠— Scar, Celtic, and Chopper ⁠— arrive and kill the remaining team members on the surface. They make their way down to the pyramid and arrive just as the team unwittingly activates the structure and is trapped within it. The Xenomorph Queen awakens from cryogenic stasis and begins to produce eggs. When the eggs hatch, several facehuggers attach themselves to humans trapped in the sacrificial chamber. Chestbursters emerge from the humans and quickly grow into adult Xenomorphs. The humans take possession of the Predator's blasters, and conflict erupts between the Predators, Xenomorphs, and humans. Celtic and Chopper are killed by a Xenomorph, and Weyland buys Lex and Sebastian De Rosa enough time to escape from Scar, giving his life in the process. The two witness Scar kill a facehugger and a Xenomorph before unmasking and marking himself with the acidic blood of the facehugger. After Lex and Sebastian leave, another facehugger attacks Scar.

Through translation of the pyramid's hieroglyphs, Lex and Sebastian learn that the Predators have been visiting Earth for thousands of years. They taught the early human civilization how to build pyramids and were worshipped as gods. Every 100 years, they visit Earth to take part in a rite of passage by which several humans sacrifice themselves as hosts for the Xenomorphs, creating the "ultimate prey" for the Predators to hunt. As a fail-safe, if overwhelmed, the Predators would activate a self-destruct device to eliminate the Xenomorphs. They deduce that the Predators lured them into the pyramid to use as a sacrifice.

Lex and Sebastian decide that the Predators must be allowed to succeed so that the Xenomorphs do not escape to the surface. Sebastian is captured by a Xenomorph, and Lex returns the blaster to Scar. They are attacked by a Xenomorph, and Lex manages to kill it. Impressed, Scar uses parts of a dead Xenomorph to fashion weapons for Lex, and the two form an alliance. Lex finds Sebastian, who has become the host of a Xenomorph. She mercy kills him, but the Xenomorph Queen is freed from her restraints and, along with the other Xenomorphs, begins pursuing Lex and Scar. Scar detaches and uses a bomb in his wrist module to destroy the pyramid and the remaining Xenomorphs and eggs. Lex and Scar reach the surface, and Scar uses acidic Xenomorph blood to mark Lex with the Xenomorph hunter symbol. However, the Xenomorph Queen reappears and attacks. They defeat the Queen by pushing her over a cliff, pulling her to the ocean floor. Scar is fatally wounded.

A Predator spaceship appears, and its crew retrieves its fallen comrade. An elder Predator presents Lex with a spear as a gift as the spaceship departs. Lex walks over to a snowcat and leaves the area. On the Predator spaceship, Scar's body lies at rest when a Predalien chestburster erupts from his chest.