Stephen Fry conjures up some hocus-pocus in a special Christmas edition of the quiz, with Daniel Radcliffe, Lee Mack, Graham Norton and Alan Davies.

Stephen Fry asks unanswerable questions about health and safety, with Ross Noble, David Mitchell, Jeremy Clarkson and Alan Davies.

Stephen Fry asks unanswerable questions about a hodge-podge of topics beginning with the letter H, with Ross Noble, Jack Dee, Phill Jupitus and Alan Davies.

Sean Lock, David Mitchell, Danny Baker and Alan Davies are quizzed on hoaxes.

Stephen Fry asks unanswerable questions about history. With Sandi Toksvig, David Mitchell, Rob Brydon and Alan Davies.

Stephen Fry asks unanswerable questions about house and home, with Bill Bailey, Eddie Izzard, Danny Baker and Alan Davies.

Stephen Fry asks unanswerable questions about body parts beginning with the letter H.

Stephen Fry asks unanswerable questions about humans, with Jo Brand, Jack Dee, Jimmy Carr and Alan Davies.

Stephen Fry asks unanswerable questions about animals which begin with the letter H, with Ruby Wax, Ross Noble, Sean Lock and Alan Davies.

Stephen Fry asks unanswerable questions about happiness, with Andy Hamilton, Rich Hall, Phill Jupitus and Alan Davies.

Stephen Fry considers some hypothetical questions with panellists Sandi Toksvig, John Lloyd, Johnny Vegas and Alan Davies.

Stephen Fry asks unanswerable questions about highs and lows, with Rob Brydon, Fred MacAuley, Sandy Toksvig and Alan Davies.

Stephen Fry asks questions about hypnosis, hallucinations and hysteria. With Ronni Ancona, Phill Jupitus, Robert Webb and Alan Davies.

Stephen Fry asks unanswerable questions about Halloween, with Chris Addison, Sean Lock, Dara Ó Briain and Alan Davies.

Stephen Fry asks unanswerable questions about horses and hunting, with Clare Balding, Dara Ó Briain, Jimmy Carr and Alan Davies.

Stephen Fry asks unanswerable questions about Holidays, with Bill Bailey, Rich Hall, Rob Brydon and Alan Davies.

A compilation of some of the best bits from the H series of QI, with Stephen Fry, Alan Davies, and a host of special guests.

A compilation of some of the best bits from the H series of QI, with Stephen Fry, Alan Davies, and a host of special guests.