Host John Barrowman welcomes Fern Britton, Ben Miller, Gyles Brandreth, Anita Rani, Catherine Tyldesley and Radzi Chinyanganya. They'll embark on a musical theatre masterclass, each hoping to steal the show with their performance and be voted All Star Musicals Champion. Equipped with mentoring from the returning panel, Elaine Paige, Samantha Barks and Trevor Dion Nicholas, the celebrities will be supported by a West End ensemble, an orchestra, and, in the lead-up to their big performance, also receive training from West End choreographers and vocal coaches.