"The Gravediggers" is the second episode of the fourth series of the 1960s cult British spy-fi television series The Avengers, starring Patrick Macnee and Diana Rigg.

It was first broadcast by Scottish Television on Tuesday 5 October 1965.

ABC Weekend Television, who commissioned the show, broadcast it in its own regions four days later on Saturday 9 October.

[1] The episode was directed by Quentin Lawrence, and written by Malcolm Hulke.

[2] Steed and Emma visit a railway buff to investigate a deathly plot to sabotage the country's early warning radar defence systems.