Ant and Dec welcome more champions of past series back to the stage, along with winners from overseas variants of the show. This week's visitors include a death-defying performance from Alexandr Magala, whose sword-swallowing skills made him a worthy winner of Russia's Got Talent. Among the old favourites putting in a return appearance are series four dancers Twist and Pulse and Collabro, the musical theatre singing group who were crowned champions of series eight. Simon Cowell, Amanda Holden, Alesha Dixon and David Walliams are on hand to pass judgement on the acts

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