Kate Beckinsale Catherine
Simon Pegg Neil Clarke
Robin Williams Dennis the Dog (voice)
John Cleese Chief Alien (voice)
Joanna Lumley Fenella
Terry Gilliam Nasty Alien (voice)
Suzy Eddie Izzard Headmaster
Michael Palin Kindly Alien (voice)
Rob Riggle Grant
Eric Idle Salubrious Gat (voice)
Meera Syal Fiona
Sanjeev Bhaskar Ray
Ronan Summers Security Man
Alexa Davies Sandwich Girl
Brian Cox Self
Jud Charlton Mortician
Bill Jones Producer
Emma Pierson Miss Pringle
James Acheson Costume Design, Production Design
Irene Lamb Casting
Gavin Scott Newsreader, Screenplay
George Fenton Original Music Composer
James Kermack Policeman
Lucy Cork Stunt Double
David Annen Newsreader
Judy Loe Canteen Lady
Peter Hannan Director of Photography
Mike Medavoy Executive Producer
Naomi Moore Set Decoration
Jennifer Bell Hairstylist
Robert Bathurst James Cleverill
Terry Jones Director, Scientist Alien (voice) / Van Driver, Writer
Marianne Oldham Rosie
John Kay Animation
Neville Phillips Author
Beranger Maurice Animation
Oriol Navarro Animation
Matt Fidler Animation
Martyn Smith Animation
Ben Timlett Producer
Julian Rodd Editor
Lennon Clarke Bank Robber
Mairi McHaffie Newsreader
Du Wenlong Animation
Rob Hemmings Animation Director
Tan Weijian Animation
Xu Yueyuan Animation
Dong Yixue Animation
Xie Liyan Animation
Li Jingxin Animation
Yan Yan Animation
Sun Xiaoxuan Animation