3/3. The race to save Asia's only great ape.
Fergal Keane narrates.
The schools that won the first and last series of the quiz field new teams to face quizmaster Geoffrey Wheeler.
Comedian Dave Gorman traces the history of the long-running children's quiz show.
Leeds take on Gower in the last grand final. Geoffrey Wheeler presents the Owl of Wisdom trophy to the winners.
Introduced by Dave Gorman.
7/8. The death in custody of drug dealer Billy Kemble pits Sam against CID as he hunts the truth. First shown on BBC1
What do the most popular shows of the year tell us about life in Britain?
Mark Lawson reveals all.