Starring: Patrick Macnee, Diana Rigg, Ronald Fraser, Paul Masse, Caroline Blakiston, and Victor Platt
Director: Quentin Lawrence
Rating: Nine of Ten Stars
In order to find the source of signals jamming Great Britain's early warning radar systems, secret agents John Steed (Macnee) and Emma Peel (Rigg) trace mysterious malfunctions at Britain's early warning radar system must first unravel the secret that links a funeral home, a charitable hospital for railway workers, and an eccentric, train-loving nobleman (Fraser).
"The Gravediggers" features an intricate plot that may seem a little odd to anyone who doesn't remember the Cold War. The threat against the early warning system was perceived as an extremely dire one in the world of 1965, so the trouble the enemy agents go through to distribute their network of jammers. The clever way by which they fund and literally power their operation is also well-conceived, so long as one is able to buy into the comic book reality that The Avengers exist in.
As is the case with all the greatest episodes during the Patrick Macnee/Diana Rigg, the serious and the silly co-exist easily in the episode. The eccentric train obsessed nobleman with his sitting room done up to mimic a railcar in motion and the miniature train and tracks he has running throughout his property is amusing, but when it gets used as a send-up of silent movie melodrama (where maidens get tied to the train tracks) and old-time westerns (where the hero battles bad guys atop moving train cars), it becomes absolutely hilarious. Even better--despite the very intentionally ridiculous nature of the episode's climactic action, there is also a real sense that Peel and Steed are in danger of losing the fight and possibly even their lives. It is an expertly written and paced episode.
Adding to the value of this episode is some nice banter between Steed and Peel, as well as another example of Peel's versatility as an undercover operative. Here, she successfully passes for a nurse in order to infiltrate the hospital.
"The Gravediggers" was the second episode to air in "The Avengers" Season Four, and it kept the momentum going from the debut.