S1, E1: Former contestants Jane Beedle and Andrew Smyth from 2016, and Liam Charles and Flo Atkins from 2017 join Sandi Toksvig and Noel Fielding for festive-themed challenges. It's down to judges Paul Hollywood and Prue Leith to decide who wins the Christmas Star Baker title. Plus, British rockers The Darkness perform their hit, Christmas Time (Don't Let the Bells End).