Rynian

Rynian was an Aridian who met the First Doctor on Aridius. He told the Doctor and Barbara about the Mire Beasts. He also told them that the Aridian elders had decreed that the Doctor and his companions were to be handed over to the Daleks. (TV: The Chase)

Behind the scenes
Rynian's name was never given on-screen, only in the credits.