John Humphrys asks the questions in a celebrity version of television's toughest quiz. He puts four brave and famous contenders through their paces, including musician Goldie, presenter Paul O'Grady, former badminton player and Olympian Gail Emms and broadcaster Loyd Grossman

John Humphrys invites four more celebrities into the spotlight where they have two minutes on their specialist subject and two minutes on general knowledge. Guests are Strictly dancer Darren Bennett, writer and DJ Stuart Maconie, psychologist Dr Linda Papadopoulos and actor Andrew Lancel

Four more celebrities face John Humphrys and try to answer questions in the black chair. The contenders hoping to show off their knowledge are newsreader Alastair Stewart, naturalist Steve Backshall, Radio 1 DJ Comedy Dave Vitty and the entrepreneur Saira Khan.

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John Humphrys introduces the celebrity version of Mastermind, in which four famous contenders pit their knowledge against each other and the clock.

In the chair are comedian Joe Pasquale; former athlete and Olympian Roger Black; actor Tony Audenshaw; and presenter Diane Louise Jordan.

John Humphrys introduces four more famous contenders to the black chair, where he tests them first on their specialist subject and then on their general knowledge. Guests are comedian Ed Byrne, actor Tristan Gemmill, television presenter Anneka Rice and comedian and actor John Bishop

John Humphrys introduces four more famous contenders to the black chair, where he tests them first on their specialist subject and then on their general knowledge. Guests are comedy writer Stewart Lee, actor John Thomson, British swimmer and Paralympian Sascha Kindred, and screen star Matthew Lewis

John Humphrys introduces four more famous contenders to the black chair, where he tests them first on their specialist subject and then on their general knowledge. Guests are writer Tony Parsons, actress Diane Parish, astrologer Russell Grant and broadcaster Paul Gambaccini.

John Humphrys introduces four more famous contenders to the black chair, where he tests them first on their specialist subject and then on their general knowledge. Guests are director Michael Winner, newsreader Mishal Husain, comedian Dom Joly and actor and satirist John Bird

John Humphrys introduces four more famous contenders to the black chair, where he tests them first on their specialist subject and then on their general knowledge. Guests are swimmer Mark Foster, actor and writer Nigel Planer, chef Ching He Huang and broadcaster John Suchet.

John Humphrys introduces four more famous contenders to the black chair, where he tests them first on their specialist subject and then on their general knowledge. Guests are singer Beverley Knight, World Champion snooker player John Higgins, politician Michael Howard and weatherman Alex Deakin