Current Official Synopsis
Ridley Scott, director of 'Alien' and 'Blade Runner,' returns to the genre he helped define. With PROMETHEUS, he creates a groundbreaking mythology, in which a team of explorers discover a clue to the origins of mankind on Earth, leading them on a thrilling journey to the darkest corners of the universe. There, they must fight a terrifying battle to save the future of the human race.
Original Official Synopsis
Visionary filmmaker Ridley Scott returns to the genre he helped define, creating an original science fiction epic set in the most dangerous corners of the universe. The film takes a team of scientists and explorers on a thrilling journey that will test their physical and mental limits and strand them on a distant world, where they will discover the answers to our most profound questions and to life's ultimate mystery.
The Plot of Prometheus
Archaeological findings suggest that our "Gods" have left us an invitation to come find them in ancient cave paintings. Dr. Elizabeth Shaw and Dr. Charlie Holloway lead the expedition as being the main scientists on board who initially discovered the finds and linked the paintings to a star map.
It is the year 2093, December 24th - right at Christmas time when the USCSS Exploration Vessel Prometheus enters the Zeta 2 Reticuli System. The crew wake up from cryo sleep and begin mission prep for landing on a moon named "LV_223" which they believe has the ability to support life.
The ship lands on the moon on what looks to be a "run-way" which leads to a series of pyramid-like structures surrounded by a wall/blockade to protect it from the elements. They later discover that these Pyramids are creating a new atmosphere inside, essentially Terraforming the planet. Once inside, the crew discover many hidden passages and rooms which contain Alien technology far beyond our comprehension.
It is upon discovering one room which contains the mysterious giant head that the crew find that they have upset the atmosphere in the room and have now triggered some kind of alarm - which causes these Urn-like objects to leak black, organic fluid.
The crew leave the temple but two crew members get lost and find themselves in that same room later on. The Black organic substance has mutated a couple worms into giant, snake like creatures known as "Hammerpedes" which resemble a similar look as that of the "Facehugger" seen in ALIEN. One of them attacks one of the crew, killing him and the other crew member gets infected by the black organic substance as well - which later mutates him into a mindless killing machine.
The story continues on to explore the reasoning behind these temples and the destructive organic materials the crew discover. We learn that these Engineers had planned on coming to Earth with this dangerous material 2000 years prior to the events of this film and that something went wrong which prevented them from completing their mission. We never truly understand just what exactly caused this - but we can assume an outbreak occurred and a dangerous Alien species was unleashed inside the complex - killing most of the Engineers working inside.
The plot thickens and reveals more questions along the way. Questions which will soon be answered in one of the many Prometheus sequels to follow. But what we do know is that LV_223 is not the Engineer home world and we know that there is a lot more out there to discover; like where the Engineers came from and why they planned to exterminate us 2000 years ago.