Steed and Emma Peel are sent to a coastal town where several agents have disappeared and discover a deadly secret.
Saying you are a fan of cult British TV without having seen The Avengers is like saying you're a Steve McQueen fan without having seen Bullitt. Having seen odd episodes from the Cathy Gale and Emma Peel eras, I finally decided to start watching the Diana Rigg seasons all the way through.
The Town of No Return is a very good debut episode for the fourth season. It plays like an episode of Department S, with the exception that it's better than most of Department S's episodes.
Patrick Macnee and Diana Rigg have undeniable chemistry, and there's plenty of recognizable actors in the guest cast, such as Terence Alexander (Charlie Hungerford from Bergerac), Juliet Harmer (Georgina from Adam Adamant Lives) and Robert Brown ("M" from the 80s James Bond's). There's an excellent fight scene at the end of the episode. Overall, very enjoyable.