Sandi Toksvig considers Wales, whales, and wails with Elis James, Griff Rhys Jones, Kiri Pritchard-McLean and Alan Davies.

Sandi Toksvig takes a look at wings and wheels with Aisling Bea, Hank Green, Desiree Burch and Alan Davies.

Sandi and Alan take a look at some weaponry with Nish Kumar, Lou Sanders and Roisin Conaty.

Sandi Toksvig has a wavey episode of QI with Phil Wang, Sara Pascoe, Tom Allen and Alan Davies.

Sandi Toksvig takes a QI look at the Wild West with Alex Brooker, Jo Brand, Eshaan Akbar and Alan Davies.

Sandi Toksvig goes a-wooing with Rosie Jones, Larry Dean, Maisie Adam and Alan Davies.

Sandi Toksvig wonders who, what and why with Daliso Chaponda, Susan Calman, Cariad Lloyd and Alan Davies.

Sandi Toksvig has a weird and wonderful episode of QI featuring Melanie Bracewell, Patrick Kielty, Roisin Conaty and Alan Davies.

Julian Clary, Fatiha El-Ghorri, Jimmy Carr and Alan Davies visit Sandi Toksvig's winter wonderland for the QI Christmas special.

Sandi Toksvig looks at animals which start with a W with Nabil Abdulrashid, Holly Walsh, Sam Campbell and Alan Davies.

Chris McCausland, Zoe Lyons, Ed Byrne and Alan Davies join Sandi Toksvig for a wet and windy episode of QI.

QI goes willy-nilly through the letter W as Sandi and Alan are joined by Josh Widdicombe, Catherine Bohart and Russell Kane.

Michael Odewale, Cally Beaton and Gyles Brandreth join Sandi and Alan for a bit of QI wordmongery.

What’s not to like about Sandi Toksvig’s look at a welter of QI 'whatnots' With Sally Phillips, Andrew Maxwell, Joanne McNally and Alan Davies.

A selection of the best moments from the W series of QI, hosted by Sandi Toksvig with Alan Davies and their guests.

More of the best moments from the W series of QI, hosted by Sandi Toksvig with Alan Davies and their guests.