A scene from The Brain of Morbius (1976). In a mind-bending contest between Time Lords, the progress of the contest is displayed on the mind-bender screen as the losing Time Lord's history of faces in regression from their current face backward.

With the continuity revelation of The Timeless Children (2020), the face of the fugitive Doctor was added to this between the last known face and the first unknown face. Any who would argue that this innovation is inappropriate because that Doctor face didn't actually appear in The Brain of Morbius are advised to review the scene and to note that the camera cuts away to a reaction shot of Sarah between the shot of the mind bender screen displaying "the first Doctor" and the shot of the mind bender screen displaying the first unfamiliar face, during which interval there was time for the viewing audience to miss one face.