Heaven Sent (in-universe)

Heaven Sent was the eleventh episode of the ninth series of Doctor Who. It followed Face the Raven.

Its synopsis noted that the episode featured the Doctor "trapped in a world unlike any other". By 10 May 2020, the episode was available on BBC iPlayer along with the rest of series 9. Petronella Osgood had started watching the episode sometime before then. (WC: The Zygon Isolation)