Thomas & Friends is a children's television series about the engines and other characters on the railways of the Island of Sodor, and is based on The Railway Series books written by the Reverend W. Awdry. This article lists and details the episodes from series 20 of the show, which started airing on 5 September 2016 in the UK, and on 21 October 2016 in the US. The series is narrated by Mark Moraghan. It is notable for being the first series since the show’s fourth to directly adapt stories from the original Railway Series books.