Professor X

Professor X was a BBC science fiction television series which ran from 1963 to 1989. The show concerned a mysterious scientist who travelled through time and space inside a TASID, a ship which resembled a pillar box on the outside. (NA: No Future) The series had merchandise created based on it (NA: Conundrum) and overseas fans in such places as the United States. (NA: Return of the Living Dad)

In 1976, the character was being played by Frankie Howerd. During that same year, Bernice Summerfield, apparently unfamiliar with this aspect of 20th century popular culture, met him inside the Mediasphere encountered the Professor in his own fictional world. Using his TASID, the Professor dropped her off in the real universe. Benny noticed his resemblance to the Doctor and appreciated the character all the more because of it. (NA: No Future) Dave Young played a Cybertron in one of the final episodes of the series. (EDA: Escape Velocity)

:The existence of the fictional character might just explain Ace's habit of calling the Doctor, "the Professor" (other than the fact that she enjoyed teasing him). This program is of course the in-universe version of "Doctor who" itself. It has yet to be revealed if it resumed in 2005.