In Terry Jones' fantasy comedy, Simon Pegg stars as Neil Clarke, a quiet secondary school teacher going nowhere. After a chance encounter with a band of eccentric aliens (voiced by all the surviving Monty Pythons), every wish he makes is granted. Will he use newly-acquired boundless powers for good or bad? The fate of the Earth is at stake. Robin Williams makes his final movie bow-wow as the voice of Neil's wisecracking mutt.