Adam works night shifts at a motorway service station, living a small and lonely life with little human contact or connection. Upon hearing that his estranged father has died, Adam finds himself piecing together a complicated image of a man that he never really knew and uncovers details of his life that he struggles to comprehend. Learning that his father believed he was not human, Adam initially dismisses the notion outright. However, unable to shake the thought, he begins to wonder: if this were true, what would that make him?

　　As the Fifteenth Doctor, played by Ncuti Gatwa, takes over the TARDIS for his first epic adventure he will be joined by Ruby Sunday, played by Millie Gibson, as she makes her debut as the Doctor’s companion.
　　The episode sees the Doctor come face-to-face with the mythical and mysterious goblins as his life collides with Ruby Sunday, played by Millie Gibson.
　　Little is known about Ruby Sunday as she was abandoned on Christmas Eve as a baby. Now living with her mum, Carla and grandmother, Cherry her world is about to be turned upside when she encounters the Doctor and the two set off on their first adventure together