It's the last chance to win a place in the finals as Gyles Brandreth presents the second of the semi-finals of the quiz without questions.
Contestants have their breadth of knowledge tested to the limit as they battle it out to impress the show's experts. Two teams are given their topics and then have just one hour to pool their knowledge before facing the Knowitall experts. The categories are sport, entertainment, business and politics.
The winners go through to the grand final and are one step closer to the prize of 15,000 pounds and the title of Britain's biggest Knowitalls.