John Humphrys presents the celebrity version of Britain's toughest quiz.
Food critic Jay Rayner, Lottery presenter OJ Borg, travel writer Simon Calder and Antony Costa from the pop band Blue, answer questions on the musicals of Sondheim, the Star Wars Trilogy, Concorde and the TV classic Only Fools and Horses.
Reality TV star Stacey Solomon, chef Sophie Grigson, The Fast Show's Simon Day and musician Steve Harley put themselves in the hot seat for their favourite charity. Specialist subjects include the sitcom The Inbetweeners, Highgate Cemetery, The Sopranos and TS Eliot and the Four Quartets.
Wildlife expert Chris Packham, athlete Jenny Meadows, children's TV presenter Alex Winters and Coronation Street actor Graeme Hawley try their luck answering questions on the Battle of Rorke's Drift, the Manic Street Preachers, Wigan Rugby League and the TV comedy Blackadder.
England cricketer Matthew Hoggard, TV presenter Jules Hudson, Comedian Justin Moorhouse and actor Ray Fearon answer questions on the sitcom Friends, the World War Two campaign Operation Market Garden, the comedian Les Dawson and Shakespeare's Othello.
Former England cricket captain Michael Vaughan, poet Simon Armitage, comedian Andi Osho and TV presenter Richard Arnold take their places on the infamous chair to answer questions on the Premier League, Ted Hughes, John Humphrys and TV soap Dallas.
Chef Michel Roux Jr, actress Jessica Hynes, Politics Show presenter Jon Sopel and Divine Comedy frontman Neil Hannon try their luck answering questions on Auguste Escoffier's Guide to Modern Cooking, Pam Ayres, Tony Blair and the sitcom Frasier.
Countdown's Rachel Riley, designer Wayne Hemingway, comedian Miles Jupp and political correspondent Gary O'Donoghue take their places in the infamous chair to answer questions on Manchester United, 1970s disco music, former England cricket captain Michael Atherton, and Winston Churchill.
Singer and 60s icon Sandie Shaw, actor Neil Dudgeon, comedian Stewart Francis and broadcaster Andrew Collins face questions in the hot seat. Specialist subjects include disaster movies of the 70s, Philip Larkin, Nichiren Buddhism and the Toronto Blue Jays.
Former home secretary Jacqui Smith, actor Nathaniel Parker, Strictly Come Dancing's Erin Boag and comedian Jason Manford are the contenders. They answer questions on The Archers, the Marx Brothers, the history of New Zealand and TV series Quantum Leap.
Football Focus presenter Dan Walker, financial guru Martin Lewis, DJ Nihal Arthanayake and Olympic cyclist Sarah Storey answer questions on the Gunpowder Plot, the Superman films, Glenn Hoddle and Sex and the City.