- You may be looking for the real world television story.
It featured the Doctor and Clara, as well as an individual resembling Missy. Its synopsis mentioned "the skies of Earth". By 10 May 2020, the episode was available on BBC iPlayer along with the rest of series 9. (WC: The Zygon Isolation)
Behind the scenes
This is a in-universe counterpart of the real world Doctor Who television story The Magician's Apprentice 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.