Thomas & Friends is a British children's television series that aired for 24 series and 584 episodes from 9 October 1984 to 20 January 2021. Based on The Railway Series books by the Reverend Wilbert Awdry and his son Christopher, the series was developed for television by Britt Allcroft. The series follows the adventures of Thomas, an anthropomorphised blue steam locomotive on the fictional North Western Railway on the Island of Sodor with his friends Edward, Henry, Gordon, James, Percy, Toby and others who are engines of The Fat Controller.