Episode 4

John Barrowman grants more of the nation's performing wishes. Alesha Dixon performs a dream duet with 11-year-old superfan Paige Phillips, while Middlesbrough student Catherine Rhatigan trips the light fantastic with the cast of Lord of the Dance. Twelve-year-old Chantelle Owens gets the surprise of her life when she gets to meet Hollywood heart-throb Zac Efron, and the teachers take on the plumbers in Work Place Wonders. And the Tonight's the Night Search for an Alien Superstar goes into lift-off as the final thirty extra-terrestrials audition in front of an expert panel, with John Barrowman, Denise Van Outen and Doctor Who's casting director Andy Pryor. But who will take one step closer to winning the out-of-this-world prize at stake - the chance to star in an exclusively written Doctor Who scene opposite Captain Jack?