Paul is an alien. He’s voiced by Seth Rogen. He decides to tag along with the sci-fi fans Graeme Willy (Pegg) and Clive Collings (Frost) which results in all sorts of drama as the FBI get involved.
There’s been a trailer for the film, of sorts, as it’s a little obscure.
Geek Tyrant (always worth a read) has published some stills from the film.
Here’s the behind-the-scenes/trailer that’s already out.