Simon Pegg character Neil Clarke
Kate Beckinsale character Catherine
Rob Riggle character Grant
Sanjeev Bhaskar character Ray
Joanna Lumley character Fenella
Marianne Oldham character Rosie
Eddie Izzard character Headmaster
Robert Bathurst character James Cleverill
Judy Loe character Canteen Lady
Brian Cox character Himself
Meera Syal character Fiona
Emma Pierson character Miss Pringle
David Annen character Newsreader
Mairi McHaffie character Newsreader
Gavin Scott character Newsreader
Robin Williams character Dennis the Dog (voice)
John Cleese character Chief Alien (voice)
Terry Gilliam character Nasty Alien (voice)
Eric Idle character Salubrious Gat (voice)
Terry Jones character Scientist Alien (voice) / Van Driver
Michael Palin character Kindly Alien (voice)
Alexa Davies character Sandwich Girl
Neville Phillips character Author
Ronan Summers character Security Man
Jud Charlton character Mortician
James Kermack character Policeman
