The first series of QI, which was based around the letter 'A', made its debut on BBC Two in September 2003. The series answered 'an avalanche of A's', with the panellists being asked about Adams, Alans, Andersons, aquatic animals, astronomy and the antidotes of QI's patron saint - Pliny the Elder.
The fifth series aimed to exterminate the end of 'E' ignorance; engaging with electricity, eating, England, Europe, empires, entertainment and elephants in the process. All the episodes in this series had an 'Elephant in the Room' bonus. Panellists could score 10 points if they spot a reference to an elephant in any of the questions. Series E also saw the introduction of the 'QI Quickie' - originally meant to be a vodcast, each one contains some unbroadcast material.
The seventh series of QI was the first to be extended to 16 episodes long. It covered everything interesting beginning with 'G' - including geography, geometry, genius and Germany. This was the first series to have some episodes broadcast transmitted before the 9pm watershed, and also the first series to feature an episode with more than three guests.
QI goes into jubilant double figures (numerically speaking) with its tenth series, jesting over subjects starting with 'J'... such as jungles, jeopardy, journalism, jobs, justice and journeys. This 16-part series features 13 panellists making their debuts, including two from the southern hemisphere who have never appeared on British TV before. This series also includes the first episode in which all three guests are women.