Director Ridley Scott is currently shooting Prometheus in London, working towards a June 8, 2012 release date. 20th Century Fox, in response to a "leaked" plot rundown, released an official synopsis for Prometheus, which you can read below.
"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."
Here is the bogus plot synopsis, which the 20th Century Fox representative described as, "way off," compared to the actual story. Even though this isn't the actual Prometheus story line, you can take a look at this fake plot description below.
"Earth. Year 2058.
Archaeological digs in Africa reveal alien artifacts that humans were genetically engineered by a advanced alien race (space jockeys). These "Alien Gods" also terraformed Earth in order to make it habitable for their human creations. Amongst finds are coordinates to the Alien God's home-world, to Paradise. Months later the Weyland Corp launch the spaceship Prometheus and his crew, into deep space to make first contact. Thanks to faster than light travel a few years later the Prometheus enters the Zeta Riticuli star system. Humans are greeted by their makers, then transported further into space to a scary yet fascinating world. The Alien Gods are proud of their "children", their first creation to reach such levels of intelligence.
As a reward they share bits of their astonishing bio-based technologies with the humans. But for one crew member of the Prometheus it's not enough. In a treacherous act he steals the "bio-source code" to Terraforming, a technology at the origin of all Gods' power, that could make humans equal to the gods. The Alien Gods may be scientists but are also ruthless conquerors, destroyers of worlds who will not accept humans as equals. They unleash on the escaping human crew their favorite bio-weapon, a creature used to "clean up" worlds before colonization. But something goes wrong in the process and humans manage to turn the bio-weapon against their makers. Giving birth to a smarter, nastier, bigger breed of gut eating creatures. Creatures that will be the demise of Paradise. What's left of the Prometheus crew manages to escape the doomed planet.
On their trail a survivor Alien God in very familiar ship with one ultimate mission.
Bring the wrath of the Gods to Earth."