The Build Room opens its doors to six junior builders from the first two series. They are paired with six celebrity helpers – comedians Rob Beckett and Joel Dommett, TV personality Spencer Matthews, Tattoo Fixer Alice Perrin, actor Joe Swash, and Star Wars veteran Warwick Davis. The builders are Jack, Guy and Abraham, Izzy, Jayden, and nine-year-old Harry. The teams do battle in festive challenges, under the watchful eye of judges Matthew Ashton and Fran Scott – with one side set to win the Lego Masters Christmas Trophy. Melvin Odoom presents.