שחקנים

• Meera Syal — Fiona
• John Cleese — Chief Alien (voice)
• Simon Pegg — Neil Clarke
• Joanna Lumley — Fenella
• Judy Loe — Canteen Lady
• Emma Pierson — Miss Pringle
• Eric Idle — Salubrious Gat (voice)
• Terry Jones
• Michael Palin — Kindly Alien (voice)
• Kate Beckinsale — Catherine
• Rob Riggle — Grant
• Sanjeev Bhaskar — Ray
• Marianne Oldham — Rosie
• Eddie Izzard — Headmaster
• Robert Bathurst — James Cleverill
• Brian Cox — himself (Professor Brian Cox)
• David Annen — Newsreader
• Gavin Scott — Newsreader
• Terry Gilliam — Nasty Alien (voice)
• Alexa Davies — Sandwich Girl
• Neville Phillips — Author
• Robin Williams — Dennis the Dog