Actor John Lithgow, comedian Jon Richardson, Paralympian Hannah Cockroft, and funny man Russell Brand take on three challenges as the contest returns. They have to make brownies, tackle a handful of a technical challenge, and also a 3-D biscuit. Presenters Sandi Toksvig and Noel Fielding guide them through the assorted tasks, and Paul Hollywood and Prue Leith passing judgment on their baking skills. (thetvdb.com)