Cedric (Search Out Space)

Cedric was a humanoid from the planet Quirk.

He resembled a black-haired, dark-skinned, clean-shaven human man wearing metallic clothes, and his voice had a high-pitched, metallic distortion to it. After meeting the Doctor’s seventh incarnation in a game show, Cedric was spotted traveling with a mustachioed incarnation of the Doctor.

Biography
Hailed as the most intelligent inhabitant of the planet Quirk, Cedric took part in the contest show The Ultimate Challenge, with the Seventh Doctor as host, and Ace and K9 as opponents. Throughout the game, Cedric proved reasonably clever, but on several occasions he made presumptions about the planet Earth (which he had never visited) which turned out to be flatly wrong. The first and most striking was his belief that the planet's shape was that of a cylinder rather than a sphere. (TV: Search Out Space)

The library on Valcea stored archival footage of a black boy in a "silver, figure-hugging spacesuit", who accompanied a mustachioed incarnation of the Doctor and Iris Wildthyme in a fight with giant owls. Marn showed this footage to the Eighth Doctor, who did not remember the events. (PROSE: The Blue Angel)