The Tripods is series of novels written by Samuel Youd (under the pen name "John Christopher") beginning in the late 1960s. The first two were the basis of a science fiction TV-series, produced in the UK in the 1980s (it was aired between September 1984 and December 1985).
Since I hit the 500 show wall, and received the recommendation to move shows that I used to watch, but which are now gone into a list, I am creating said list.