The Tripods was a tv adaptation of the trilogy of books by John Christopher, however only the first two books were dramatised, as the third series was cancelled. / In the year 2089, the human race has technologically regressed after being conquered and enslaved by the 'Tripods' - huge three-legged machines controlled by unseen aliens. At the age of 14 all teenagers are fitted with a mind control device called a 'Cap' which makes them docile and amenable to the tripods. To avoid this, cousins Will and Henry run away to try and find a group of free people that they have heard rumours about. Their quest leads them from England to France, where they find a boy nicknamed Beanpole who joins up with them. /