Alexander Armstrong and co-host Richard Osman are joined by children's television stars for a special celebrity edition of the quiz that tests the depths of your general knowledge. These celebrities try to come up with the answers that no-one else could think of.

Featuring Sarah Greene and Mike Smith from Saturday Superstore, Grange Hill's Erkan Mustafa and Lee MacDonald, The O-Zone's Jamie Theakston and Jayne Middlemiss, and Blue Peter presenters Peter Duncan and Mark Curry, with special guest Keith Chegwin. Show less