Ridley Scott

For 'Prometheus,' I came back to a very simple question that haunted me that appears in the first 'Alien,' and no one answered in subsequent Alien films: who was the 'Space Jockey' - the big guy in the seat? If you really go into that, it becomes the basis for a pretty interesting story.

Supplying fuel for a Mars expedition from the lunar surface is often suggested, but it's hard to make it pay off - Moon bases are expensive, and just buying more rockets to launch fuel from Earth is relatively cheap.

The craziest place I've probably ever visited while filming would have to be Jordan. I did a small test shoot for a test movie. We arrived in Jordan, and we stayed in Amman for a night. Then we drove down for three hours into the middle of the Wadi Rum Desert, which is in the absolute middle of nowhere. It was insane.