The Timeless Children (in-universe)

An episode of Doctor Who was recommended to Petronella Osgood under "More episodes" when she watched The Zygon Invasion on BBC iPlayer on 10 May 2020.

It featured what appeared to be a Cyberman. (WC: The Zygon Isolation)

Behind the scenes
Although it was unnamed in WC: The Zygon Isolation, it was named "The Timeless Children" in the real world.

Important note
This is a in-universe counterpart of the real world Doctor Who television story The Timeless Children 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 decide to watch The Zygon Invasion on BBC iPlayer.