Bradley Walsh presents as former Tory MP Edwina Currie, Countdown maths whizz Rachel Riley, Boyzone's Keith Duffy and Emmerdale's Mark Charnock (Marlon Dingle) pit their wits against ruthless quiz genius the Chaser in the hope of winning a potential prize pot worth thousands of pounds for their chosen charities. They must work as a team and play strategically to answer general knowledge questions against the clock and race down the game board to the exit without being caught