In the first episode of the 'O' series, Sandi Toksvig sets out in search of 'Ologies' and 'Odoxies' - and finds out how an amusement arcade helped to win the Cold War, meets a lizard with three eyes, and much else besides. The guests are Bill Bailey, Phill Jupitus and Claudia Winkleman.

Sandi Toksvig looks at multiple Organisms. Where else are you going to meet the world's deadliest hunter, a photographer hidden inside an ox, and a juggling otter, all in the same room? With Nish Kumar, Cariad Lloyd and Holly Walsh.

Sandi Toksvig looks at the oceans. Tune in to hear one publisher's suggestion for a radical improvement to Moby Dick. With Aisling Bea, Joe Lycett, David Mitchell and Alan Davies.

Sandi Toksvig looks at over and ova. Learn some tricks you can do with eggs, meet a flying pig and join in as the studio audience sings along with western film themes. With Bill Bailey, Jan Ravens, Grayson Perry and Alan Davies.

Sandi Toksvig considers all things odorous and odious. Why is the world's second-smelliest man so frustrated? Sandi has the answer. With Sally Phillips, Ross Noble, Nish Kumar and Alan Davies.

Sandi Toksvig considers various odds and ends. Ever wondered how to tell a schnauzerorgan from a paddywhack? Sandi has the answers. With Romesh Ranganathan, Matt Lucas, Liza Tarbuck and Alan Davies.

Sandi Toksvig looks at opposites. Find out how to sort the sheep from the goats, discover the opposite of Tarzan, as well as meet the telescope that points straight through the Earth. With Sara Pascoe, Colin Lane, Jimmy Carr and Alan Davies.

Sandi Toksvig looks at operations. If you've ever wondered how to turn a muffin into an offensive weapon, this is the show for you. With Bill Bailey, Katherine Ryan, Rhod Gilbert and Alan Davies.

Sandi Toksvig hosts the QI Christmas special, with Jason Manford, Romesh Ranganathan, Holly Walsh and Alan Davies. Learn the best way to wrap an awkwardly shaped present and how to get wine stains out of the carpet.

Sandi Toksvig looks into some origins and openings, with Josh Widdicombe, Susan Calman, Rich Hall and Alan Davies. Tune in to hear what Mr First thought of Mr Second, and much more.

Sandi Toksvig looks at some Objects And Ornaments. Along the way, you'll discover where you can find an actual UFO, and meet the world's best-dressed crab. With Sarah Millican, Alice Levine and Cariad Lloyd.

Sandi Toksvig looks into the occult. Ever wondered how a Hand of Glory can make you rich? Sandi has all the answers. With Aisling Bea, Russell Brand, Noel Fielding and Alan Davies.

Sandi Toksvig organises an omnishambles. Learn how to throw the two-handed javelin, meet the woman who never knew that she had won an Olympic gold medal, and much more besides. With Josh Widdicombe, Stephen K Amos, Cally Beaton and Alan Davies.

Sandi Toksvig looks at some oddballs. Tune in for the odd ball games, but be sure to stay for the vegetarian goatsuckers - you won't regret it. With Jason Manford, Jimmy Carr, Victoria Coren Mitchell and Alan Davies.

Sandi Toksvig looks into occupations and offices with Deirdre O'Kane, Richard Osman, David Mitchell and Alan Davies.

Sandi Toksvig ventures overseas to find out about Allotment Annies, who keeps their brothers in a cage, and much else besides. With Bill Bailey, Colin Lane, Desiree Burch and Alan Davies.

A compilation of some of the best bits from Series O, with Sandi Toksvig and Alan Davies.

More of the best bits from Series O, with Sandi Toksvig, Alan Davies and guests.