Cedric (Search Out Space)

Cedric was a humanoid inhabitant 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.

The Ultimate Challenge
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 fellow challengers.

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)

Later travels with the Doctor
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)

Personality and abilities
Cedric was intelligent by the standards of his planet Quirk but showed a lack of understanding of simple parts of Earth knowledge.

Cedric was capable of doing an American accent while doing a commercial, with Ace, advertising a travel agents. (TV: Search Out Space)