Harrison Ford didn't understand 'Cowboys & Aliens' when he first read The Script.

The 68-year-old actor takes a leading role in the movie - set in a 1870s mid-western US town under attack by aliens - alongside James Bond star Daniel Craig, and he admits he threw his copy across the room and demanded to speak to his agent upon seeing the first 30 pages, and had to see the film's director John Favreau to discuss the part.

He said: "Well I read 30 pages and then I threw it across the room and I called my agent and I said, 'I don't get it. There's nothing in this for me. Why are you asking me to do this?'

He said, 'Have a little faith, this is the way of the world now. You're an older person, maybe you don't understand how things work. Read the rest of the script.' So I read the rest of the script, and I said, 'I don't get it!' So I said, 'Why don't I go and see John Favreau?' "

However, the 'INDIANA JONES' star was eventually convinced because he saw it as an opportunity to try something new.

Speaking in discussion with John, he added: "I thought this was clearly something I haven't done before and one of the things to do at this stage is something if you haven't done before. As much as I have been part of sci-fi movies, I always approach them as fairytales. I didn't really think of the sci-fi."