Seth Rogen is Paul May 27, 2009 Seth Rogen and Jason Bateman join Pegg/Frost for sci-fi comedy “Paul” Seth Rogen and Jason Bateman have joined the cast of the forthcoming sci-fi comedy “Paul”. The movie stars Simon Pegg and Nick Frost as two sci-fi nuts on a road trip to Area 51, where they encounter an alien named Paul. According to Variety, Seth Rogen has been hired to play the voice of the alien. It is not yet known who Bateman will play. Other cast members recently confirmed for the film include Kristen Wiig, Bill Hader and Jane Lynch.