A brief flashback in this Nigeria-set episode dives deep into the Doctor's past.

The face looks familiar, but who's the other Time Lord in 'Doctor Who: The Story & the Engine'?

Source: space
Source Link: https://www.space.com/entertainment/space-movies-shows/the-face-looks-familiar-but-whos-the-other-time-lord-in-doctor-who-the-story-and-the-engine