Christopher Baker

Christopher Baker was a production assistant within the BBC Plays department in the 1970s. He made an uncredited onscreen appearance, after volunteering when a call-out was made internally within the BBC staff for people to cameo during the mindbending contest in The Brain of Morbius, as one incarnation of the Doctor with beard and hat. (DWM 329)

According to Stuart Humphryes and Obverse Books, as of November 2020 he had already passed away.