AN astronaut becomes stranded on an alien planet in this lively and animated family-fun comedy starring the voices of John Cleese and Dwayne Johnson. Former wrestler Dwayne 'The Rock' Johnson voices Captain Charles 'Chuck' Baker, an American space traveller who is sent to explore a distant planet. But when he lands on Planet 51 he discovers it is already populated by little green people who are living a 1950s-style existence. To them Chuck is the scary alien intruder. With the help of his new friend Lem (Justin Long) and robot companion 'Rover', Chuck must find his way through the mystifying landscape of Planet 51 back to his spaceship. But first he has to avoid the evil General Grawl (Gary Oldman) and Professor Kipple (John Cleese) who wants to put him on display in their Alien Invaders Space Museum. We have three pairs of tickets for readers to win to see Planet 51 at Cineworld in Huntingdon. To be in with a chance of winning a pair, just tell us the name of Chuck's robot companion. Send your answer on a postcard or sealed envelope to: Planet 51 competition, The Hunts Post, 30 High Street, Huntingdon, PE29 3TB or e-mail Natalie.firstname.lastname@example.org Entries should include your name, address and a daytime telephone number and reach us by Friday, December 18. Usual Archant competition rules apply.