cast
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Simon Pegg
Neil
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Kate Beckinsale
Catherine
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Sanjeev Bhaskar
Ray
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Rob Riggle
Grant
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Robert Bathurst
James Cleverill
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Eddie Izzard
Headmaster
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Joanna Lumley
Fenella
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Marianne Oldham
Rosie
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Emma Pierson
Miss Pringle
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Meera Syal
Fiona
- Mojo Dennis the Dog
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Robin Williams
Dennis the Dog (voice)
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John Cleese
Chief Alien (voice)
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Terry Gilliam
Nasty Alien (voice)
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Eric Idle
Salubrious Gat (voice)
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Terry Jones
Scientist Alien (voice) / Van Driver
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Michael Palin
Kindly Alien (voice)
- James David Robinson Steve
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Judy Loe
Canteen Lady
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Alexa Davies
Sandwich Girl
- Ellie Green Lavender
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Professor Brian Cox
Self
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James Kermack
Policeman
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Brenda Emmanus
Reporter
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Neville Phillips
Author
- Edward Fisher Mr. Eriksson
- Simon Coleman Police Inspector
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Ronan Summers
Security Man
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David Annen
Newsreader
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Mairi McHaffie
Newsreader
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Gavin Scott
Newsreader
- Richard Suchet Newsreader
- Christopher Chesser Documentary Voice (voice)
- Margarita Doyle Alien Computer Voice (voice) / Señorita Lopez
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Jud Charlton
Mortician
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Lennon Clarke
Bank Robber
- John Bedford Ray Worshiper
- Marli Bland Ray Worshiper
- Basia Forrest Ray Worshiper
- Liliana Gane Ray Worshiper
- Lorna Lacey Ray Worshiper
- Debbie J. Nash Ray Worshiper
- Christian Palmer Ray Worshiper
- Zara Sorensen Ray Worshiper
- Chris Weeks Ray Worshiper
- Robert Jones Pink Policeman
- Chris Daniels Pink Policeman
- Charlie Richards Pink Policeman
- Samuel Timlett Baby
- Lasco Atkins Party Guest (uncredited)
- Hannah Blamires Photographer (uncredited)
- Stuart Budd Passerby (uncredited)
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Marat Khairoullin
Zombie (uncredited)
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Jorge Leon
Celebrity (uncredited)
- Tremayne Miller Book Launch Guest (uncredited)
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Lockhart Ogilvie
Ray Worshiper (uncredited)
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Tony Pankhurst
Father (uncredited)
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Alan Yentob
Man at Party (uncredited)