The Girl Who Died (in-universe)

The Girl Who Died was the fifth episode of the ninth series of Doctor Who. It followed Before the Flood and was succeeded by The Woman Who Lived.

It featured the Doctor and Clara Oswald, as well as an individual resembling Ashildr. Its synopsis mentioned that the Doctor and Clara "help[ed] protect a Viking village". 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 Girl Who Died 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.