Kilik

Kilik was a member of a primitive tribe on a planet. His species lived in an accelerated time stream, meaning centuries passed for them while seconds passed for others. He lived near the First Doctor and Ian Chesterton, who seemed to be frozen in time. When his son Ethric was sent to give an offering to the Doctor and Ian, he admitted that he didn't think they were spirits, but was unable to guess what they really were. (AUDIO: Rise and Fall)