The Avengers was a British television series featuring secret agents in 1960s Britain. The programmes were made by TV company Associated British Corporation, and created by its Head of Drama Sydney Newman. It was an early example of the spy-fi genre, combining secret agent storylines with science fiction elements. Running from 1961 to 1969, it is the longest running espionage series produced for English-language television, though the American series Mission: Impossible had more episodes (171).
During its run, The Avengers was marked by different eras as different co-stars came and went. The only constant was John Steed, played by Patrick Macnee.