There have been all kinds of rumors about what exactly Ridley Scott's new sci-fi epic Prometheus is about. And now it seems like we may have an answer.

Pirates of the Caribbean: On Stranger Tides is crashing into theaters, and already has its work cut out for it: the last three films in the franchise were profitable, although the third got mixed reviews compared to the first two. But if history is any indication, On Stranger Tides has more to overcome: the fourth film in a sci-fi series has a long tradition of bombing, sometimes so hard that it blows up the entire franchise.

The guys at the Prop Store of London know that the stories behind sci-fi props can sometimes be as fascinating as the props themselves. That's why they'll be popping up on Blastr from time to time, taking a look at the untold stories of some amazing objects from movies and TV—such as the Nostromo spaceship from Alien, which was left under a tarp on a driveway for two decades until it was rescued and restored. It's impossible to say where modern sci-fi might be without Ridley Scott's Alien. At the center of the seminal 1979 film was not only the psycho-sexual design of H. R. Giger, but also the space tug upon which ninety percent of the film took place: The Nostromo.

Guess which Oscar-winning female star has backed out of a role in Clint Eastwood's new movie—and may now possibly star in the Alien prequel?