Richard Ayoade hosts the game show, inviting veteran broadcaster Richard Madeley, comedian Joe Wilkinson, TV presenter Kate Garraway, Blue Peter's Radzi Chinyanganya and former Pussycat Doll Ashley Roberts to take his golden hand and tackle a number of physical, skill, mystery and mental challenges. Their aim is to win the elusive crystals - and the more they win, the more time they get in the Crystal Dome.