The “Two Against the Underworld” guidebook by Richard McGinlay, Alan Hayes, and Alys Hayes was published for the first time in 2015 and in a revised edition in 2017.

“The Avengers” is a show that made television history yet its origins are in some ways obscure, above all, because series 1 was almost completely lost. The authors did a considerable amount of research based on the source material and various sources to try to offer as complete a guide as possible to the creation of the show and the production of series 1, the reason for the subtitle “The Complete Unauthorized Guide to The Avengers Series 1”.