Doom, the movie based on the popular video game, stars popular action hero The Rock as everyone's favorite space marine.  How did The Rock prepare himself for the rigors of battling demons on Mars?  He appeared on Late Show with David Letterman earlier this week to discuss the depth he brought to the classic character.

The Rock starts to say how he studied up for the part and how he worked up his deep emotional feelings when he . . . and then he stopped and said "Who am I kidding? All I do is beat up guys." He adds, "I'm just a big, badass guy with a big, badass gun. There's no real acting involved."

I smell an Academy Award headed to a certain guy with a big, badass gun!  Doom opens in theaters nationwide today.