The Tripods is a franchise created by John Cristopher in his The Tripods book trilogy. It is a story of humanity having been been conquered and enslaved by Tripods, gigantic three-legged walking machines, piloted by unseen alien entities who are later identified as Masters. Human society is largely pastoral, with few habitations larger than villages. Life style is reminiscent of the Middle Ages, but small artifacts from the Modern Age are still used, giving individuals and homes an anachronistic appearance.
Humans are controlled when they reach puberty by cranial implants called Caps, which suppress curiosity and creativity. Caps leave the recipients placid and docile, incapable of dissent. People who are Capped are happy to serve the Tripods. Some people, whose minds are broken under the pressure of the Cap's hypnotic power become Vagrants, who wander the countryside.
The story of The Tripods was originally conveyed through three novels: The White Mountains, The City of Gold and Lead and The Pool of Fire. 20 years later a fourth book, When the Tripods Came, was written as a prequel to the original trilogy.
The television version of The Tripods was jointly produced by the BBC in the United Kingdom and the Seven Network in Australia. The music soundtrack was written by Ken Freeman. Series One covers the first book, The White Mountains; Series Two covers The City of Gold and Lead. Although a television script had been written for the third series, it never went into production.
Graphic adaptations of the books and the TV Series.