Theme: Heroes night (songs inspired by the Olympic Games) The result of the wildcard vote is revealed before the performances as 12 Become 13 Special Guests: Olympians Laura Trott, Lizzie Armitstead, Danielle King, Joanna Rowsell, Nicola Adams, Luke Campbell, Jade Jones, Tom James, Pete Reed, Alex Gregory and Charlotte Dujardin appeared as guests in the audience, and One Direction made a brief guest appearance on Saturday's show, being interviewed by O'Leary after the first performance and giving advice to the contestants. (thetvdb.com)