Stratford, London, UK, 28 April 2013. Participants in the annual SCI-Fi-LONDON parade dress up as their favourite TV, game, comic or film related characters in the run up to the festival which takes 30 April to 6 May 2013. The festival includes new genre movies, events, talks and workshops. Here men dressed as different incarnations of Doctor Who stand behind their enemy, a Dalek. Credit: Stephen Chung/Alamy Live News

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