Dara O Briain hosts a quiz celebrating 50 years of BBC Two in which teams of celebrities answer questions about the channel's programmes and stars. The panellists are Mock the Week's Hugh Dennis, Deborah Meaden of Dragons' Den, Dave Myers of the Hairy Bikers, Professor Brian Cox, Goodness Gracious Me star Meera Syal and choirmaster Gareth Malone, with Pointless co-host Richard Osman on hand to supply extra facts and figures