The Witch's Familiar (in-universe)

The Witch's Familiar was the second episode of the ninth series of Doctor Who. It followed The Magician's Apprentice and was succeeded by Under the Lake.

It featured the Doctor and the Daleks. Its synopsis mentioned that the Doctor was "trapped and alone" on a "terrifying planet". By 10 May 2020, the episode was available on BBC iPlayer along with the rest of series 9. (WC: The Zygon Isolation)

Important note
This is a in-universe counterpart of the real world Doctor Who television story The Witch's Familiar that exists within the Doctor's universe. It was a visual meta-fictional cameo in The Zygon Isolation, where Petronella Osgood and her Zygon duplicate scroll through BBC iPlayer searching for something to watch.