New series. Maze Master Richard Ayoade guides Olympic legends Kelly Holmes and Greg Rutherford, grime MC Big Narstie, actress Jorgie Porter and internet superstar Alfie Deyes through the Aztec, Medieval, Industrial and Futuristic zones. In each one, the contestants must conquer physical, skill, mystery and mental challenges in a bid to win crystals to swap for time inside the iconic Crystal Dome. Along the way, Big Narstie comes face to face with Jarhead, so how will the master of grime cope with his mighty riddles?