As the paradox from the R-101 airship starts to unravel time and space, The Doctor and Charley, together with President Romana, go beyond the confines of our Universe to a world populated by "neverpeople", those who exist outside of time and space. It is in this Neverland that the Doctor uncovers the origins of a legend from the earliest days of Gallifrey's history that tells the story of a powerful Time Lord and a creature from an ancient nursery rhyme known as Zagreus.