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.

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.

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.

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.

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.

Contestants include Michael Sheen, Steve Pemberton, Mark Benton and Jess Robinson, Anita Harris, Bobby Crush, Neil Ruddock and Steve McMahon.

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.

A Halloween edition featuring Richard Blackwood, Joe Swash, Sam Nixon, Mark Rhodes, Yvette Fielding, Timmy Mallett, Anne Diamond and Kate Lawler.

A writers edition featuring Laurence Marks, Maurice Gran, Terry Deary, Eve Pollard, Jojo Moyes, Jeffery Deaver, Peter James and Dreda Say Mitchell.

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.

Contestants include Rachel Fairburn, Kiri Pritchard-McLean, Cannon and Ball, Gloria Hunniford, Angela Rippon, Lindsey Russell and Radzi Chinyanganya.

A St Andrew's Day special featuring Gordon Kennedy, Jack Docherty, Max Evans, Chris Iwelumo, Phyllis Logan, Fish, Michelle McManus and Kaye Adams.

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.

A Christmas special featuring Christopher Biggins, Paul Zerdin, Gary Wilmot, Michelle Collins, Debbie McGee, Richard Cadell with Sooty, Faye Tozer and Duncan James.

A children's TV special featuring Paul Chuckle, Dani Harmer, Gwyneth Powell, George Christopher, Hacker and Dodge T Dog, Andy Day and Cerrie Burnell.

A celebrity soaps edition featuring Davood Ghadami, James Bye, Sharon Maughan, Tina Hobley, Steven Arnold, Julia Haworth, Julie Peasgood and Louis Emerick.

A comedians edition featuring Sofie Hagen, Jenny Eclair, Cariad Lloyd, Darren Harriott, Nish Kumar, Ed Gamble, Simon Evans and Geoff Norcott.

A special episode featuring Tanni Grey-Thompson, David Wilkie, Matthew Hoggard, Graeme Swann, Jo Pavey, Ade Adepitan, Helen Glover and Heather Stanning.

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.

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.

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.

An Ireland-themed edition featuring Foster and Allen, Pauline McLynn, Henry Kelly, Vogue Williams, Clodagh McKenna, Anna Haugh and Jimmy Cricket.