Shaun of the Dead guys take on UFO sci-fi

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Dec 14, 2012, 4:09 PM EST

Simon Pegg and Nick Frost—the stars of and creative forces behind Shaun of the Dead and Hot Fuzz—will team up next with Seth Rogen for the sci-fi E.T. comedy Paul.

Pegg and Frost co-wrote Paul and star as English sci-fi fans who encounter an actual alien, voiced by Rogen, as they tour America to see famous UFO sites (after a stop at Comic-Con in San Diego). Rogen's Paul is a computer-generated alien, and Superbad director Greg Mottola has completed filming in and around Albuquerque, N.M.

Now that the movie's in post-production, a lot of Rogen's previously recorded dialogue will have to be tweaked and changed, Frost says.

"The stuff that we [recorded] with Seth, that was [in] the first two weeks [of] preproduction," Frost said in an exclusive interview last week in London, where he was promoting Pirate Radio. "Then we've started shooting, and a lot of the lines have been changed and stuff. So then Seth will go in post-production now and re-voice the character."

Between what Frost and Pegg said on set and what Rogen is saying in post, expect Paul to offer a raunchy take on sci-fi. "We were pushed to make it R [rated]," Frost said.

Frost can take credit for one of the film's oddest jokes. The name of the agent chasing the trio is Lorenzo Zoil (Jason Bateman). Put the names together, and it sounds like "Lorenzo's Oil," which is also the title of a movie about the parents who developed a cure for their son's rare disease.

"That was one of mine," Frost said. "It's just one of those things that I kind of like doing, that thing that you take one letter from the surname and add it to the forename and it becomes something completely different. It's possible someone could be called Lorenzo Zoil."

The writers were so proud of that joke that they paused to celebrate. "I think we took the rest of the day off when I thought of that," Frost said.

Frost wouldn't spill the specific locations the characters visit on their alien road trip, but assured fans that he and Pegg did research during their own real-life UFO tour. "I don't want to say, because it would give away bits about the plot, but Simon and I did the road trip a couple of years ago," Frost said. "In January we hired an RV, and we drove from L.A. for eight, nine days up through the American Midwest, ending up in Colorado."

Paul is due out in 2010.