"I just wanted to make a living as an actor," he said. "I didn't know about this."

The film looks like an old-fashioned Western when suddenly a spaceship arrives. Favreau said he aimed to balance the two genres without relying on too many computer-generated effects.
"The take was make a by-the-book Western right down the middle ... and mix it with the type of sci-fi movie I grew up with, before they had CG when it was verging on horror," he said. "Then just use GCI to do what they couldn't do back then."
Cowboys & Aliens is set for release in July 2011.