Robert Downey Jr. at the 2008 MTV Movie Awards held at the Gibson Amphitheater - press room. Universal City, California USA - 01.06.08

The Iron Man star is in talks to sign on to the film, about an alien spaceship that lands in the Wild West, according to the Hollywood Reporter.

Brian Grazer and Ron Howard will produce the film, which has been in development for a decade.

Source: WENN