John Barrowman hosts as celebrities Michaela Strachan, Jacqueline Jossa, Alex Beresford, Lisa George, Colin Salmon and Danny Care perform songs from hit musicals including Hamilton, Les Misérables, Frozen and The Greatest Showman. West End stars Elaine Paige, Samantha Barks and Trevor Dion Nicholas judge their efforts, while the performer who gets the most votes from the studio audience will be crowned the winner.