As the numbers start to dwindle, expectations are higher than ever as the contestants battle it out to win the 'once-in-a-lifetime' role in Jesus Christ Superstar. The bottom two have to perform again in the sing-off in front of the studio audience and the panel, with Andrew Lloyd Webber deciding which contestant to save. After that, the remaining finalists take their turn on the stage to compete once more for the support of the public. Amanda Holden presents.