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Comedy
Episode number: 1
Overview: Alexander Armstrong and Richard Osman present a special comedy edition of the general knowledge quiz in which four teams try to come up with the answers that no-one else could think of. Featuring Ralph Ineson, John Thomson, Janine Duvitski, Tony Maudsley, Melvyn Hayes, Stuart McGugan, Vicki Pepperdine and Rosie Cavaliero.
Space and Science
Episode number: 2
Overview: Alexander Armstrong and Richard Osman present a special edition of the quiz featuring big names from the world of science, including Rick Edwards, Michael Brooks, Mark Thompson, Maggie Aderin-Pocock, Heather Couper, Nigel Henbest, Dallas Campbell and Lucie Green.
Radio 2
Episode number: 3
Overview: Alexander Armstrong and Richard Osman present a special Radio 2 edition of the quiz, featuring Craig Charles, Gary Davies, Jo Whiley, Trevor Nelson, Ken Bruce, Angela Scanlon, Rev Kate Bottley and Jason Mohammad. Also featuring a special performance by Rick Astley.
Journalists
Episode number: 4
Overview: A special journalists edition of the general knowledge quiz, featuring Owen Jones, Paris Lees, Kay Burley, Adam Boulton, Carole Malone, Quentin Letts, Amol Rajan and Victoria Derbyshire.
BBC Music Day
Episode number: 5
Overview: A BBC Music Day edition featuring Tom Ogden, Ray BLK, Shaun Ryder, Rowetta, Ricky Wilson, Will Young, Naughty Boy, Lesley Garrett and a special performance by Blossoms.
Special
Episode number: 6
Overview: Contestants include Michael Sheen, Steve Pemberton, Mark Benton and Jess Robinson, Anita Harris, Bobby Crush, Neil Ruddock and Steve McMahon.
Food and Drink
Episode number: 7
Overview: A special food and drink edition of the general knowledge quiz in which four teams try to come up with the answers that no-one else could think of. Presented by Alexander Armstrong and co-host Richard Osman, with contestants Ken Hom, Ching-He Huang, Candice Brown, Atul Kochhar, Andi Oliver, Michael O'Hare, Matt Tebbutt and Olly Smith.
Musicals
Episode number: 8
Overview: A special musicals edition of the general knowledge quiz in which four teams try to come up with the answers that no-one else could think of. Presented by Alexander Armstrong and co-host Richard Osman, with contestants Rufus Hound, Trevor Dion Nicholas, Ria Jones, Sophie Evans, Carley Stenson, John Owen-Jones, Jodie Prenger and Denise van Outen.
Halloween
Episode number: 9
Overview: A Halloween edition featuring Richard Blackwood, Joe Swash, Sam Nixon, Mark Rhodes, Yvette Fielding, Timmy Mallett, Anne Diamond and Kate Lawler.
Writers
Episode number: 10
Overview: A writers edition featuring Laurence Marks, Maurice Gran, Terry Deary, Eve Pollard, Jojo Moyes, Jeffery Deaver, Peter James and Dreda Say Mitchell.
Family
Episode number: 11
Overview: A special family edition featuring Ade Edmondson, Beattie Edmondson, Helen Richardson-Walsh, Kate Richardson-Walsh, Dr Ranj Singh, Min Singh, Mark Steel and Elliot Steel.
Special
Episode number: 12
Overview: Contestants include Rachel Fairburn, Kiri Pritchard-McLean, Cannon and Ball, Gloria Hunniford, Angela Rippon, Lindsey Russell and Radzi Chinyanganya.
St Andrew's Day
Episode number: 13
Overview: A St Andrew's Day special featuring Gordon Kennedy, Jack Docherty, Max Evans, Chris Iwelumo, Phyllis Logan, Fish, Michelle McManus and Kaye Adams.
Sports Personality of the Year
Episode number: 14
Overview: A special edition marking Sports Personality of the Year 2019. Presented by Alexander Armstrong and co-host Richard Osman, with participants Ama Agbeze, Greg Rusedski, Eddie Izzard, Hannah Cockcroft, Rebecca Adlington, Michael O'Neill, Jayne Torvill and Robin Cousins. Featuring a guest appearance by the 2018 Sports Personality of the Year, Geraint Thomas.
Christmas Special
Episode number: 15
Overview: A Christmas special featuring Christopher Biggins, Paul Zerdin, Gary Wilmot, Michelle Collins, Debbie McGee, Richard Cadell with Sooty, Faye Tozer and Duncan James.
Children's TV
Episode number: 16
Overview: A children's TV special featuring Paul Chuckle, Dani Harmer, Gwyneth Powell, George Christopher, Hacker and Dodge T Dog, Andy Day and Cerrie Burnell.
Soaps
Episode number: 17
Overview: A celebrity soaps edition featuring Davood Ghadami, James Bye, Sharon Maughan, Tina Hobley, Steven Arnold, Julia Haworth, Julie Peasgood and Louis Emerick.
Comedians
Episode number: 18
Overview: A comedians edition featuring Sofie Hagen, Jenny Eclair, Cariad Lloyd, Darren Harriott, Nish Kumar, Ed Gamble, Simon Evans and Geoff Norcott.
Sport
Episode number: 19
Overview: A special episode featuring Tanni Grey-Thompson, David Wilkie, Matthew Hoggard, Graeme Swann, Jo Pavey, Ade Adepitan, Helen Glover and Heather Stanning.
Experts
Episode number: 20
Overview: Four teams of celebrity experts try to come up with the answers that no-one else could think of. Presented by Alexander Armstrong and co-host Richard Osman with contestants Dr Zoe Williams, Dr Hilary Jones, Joe Swift, Rachel De Thame, Francis Wilson, Alex Beresford, Linda Barker and Judi James.
1970s
Episode number: 21
Overview: A 1970s-themed edition of the general knowledge quiz in which four teams try to come up with the answers that no-one else could think of. Presented by Alexander Armstrong and co-host Richard Osman with contestants Valerie Leon, Mick Miller, Steve Harley, Mike Batt, John H Stracey, Tina Charles, Zandra Rhodes and Britt Ekland.
Wales
Episode number: 22
Overview: A celebrity Wales edition of the general knowledge quiz in which four teams try to come up with the answers that no-one else could think of. Presented by Alexander Armstrong and co-host Richard Osman, with contestants Di Botcher, Charles Dale, Colin Jackson, Shane Williams, Lucie Jones, John Owen-Jones, Ruth Madoc and Sophie Evans.
Ireland
Episode number: 23
Overview: An Ireland-themed edition featuring Foster and Allen, Pauline McLynn, Henry Kelly, Vogue Williams, Clodagh McKenna, Anna Haugh and Jimmy Cricket.