Stephen Mulhern hosts this special edition in which 10 illusionists from the talent show and its global counterparts take to the stage. Penn Jillette, one half of American comedy magic duo Penn and Teller, joins BGT stalwarts Amanda Holden, Alesha Dixon and David Walliams on the judging panel, while the theatre audience chooses the winner, who walks away with a cheque for £50,000. Who will be crowned the Ultimate Magician and take the cash prize?