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OTRC: Seth Rogen says he tried to make 'Paul' as real as 'Roger Rabbit' - See video

Seth Rogen talks to OnTheRedCarpet.com about his character's drug habit at the premiere of 'Paul,' which opens on March 11, 2011.

Seth Rogen, who voiced the alien in "Paul," talked to OnTheRedCarpet.com about how the movie is similar to "Who Framed Roger Rabbit" at the film's Hollywood premiere on March 14, 2011.

"I think 'Who Framed Roger Rabbit' is kind of the best version of a movie like this," Rogen told OnTheRedCarpet.com. "I think that movie really seemlessly integrated an animated character with live-action actors and you don't even think about the fact that it's fake and it's not based on the fact that it looks real, because it doesn't, but based on the fact that the interactions feel real and the performances feel real."

"Paul" follows two sci-fi nerds named Willy (Simon Pegg) and Clive (Nick Frost) make a pilgrimage to America's UFO heartland, Area 51 in Nevada. When they get there, they meet an alien named Paul (voiced by Rogen) who has escaped the military base where he had been held for 60 years. When Paul joins the two on a road trip, federal agents (Jason Bateman, Bill Hader, and Joe Lo Truglio) and the father of a young woman (Kristen Wiig) that they accidentally kidnapped start following them.

The film also features performances by Jane Lynch, Blythe Danner, John Carroll Lynch, David Koechner and Sigourney Weaver.

"I spent a lot of time in a recording booth, talking and watching the movie," Rogen told OnTheRedCarpet.com. "We spent a lot of time trying to make sure it felt like he's really there and it really took a long time."

Rogen got his start on the popular but short-lived Judd Apatow TV series, "Freaks and Geeks." He has since written and starred in movies like "Pineapple Express," "Superbad" and "The Green Hornet."

One of Rogen's next movies is a comedy about cancer called "50/50," which co-stars Joseph Gordon-Levitt and is set for release on September 30, 2011.

"Paul" is set for release on March 18, 2011. Watch the trailer below.

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