The Ghost Boy is a young sorcerer who was executed during The Great Purge.
Biography
The Ghost Boy appears for the first and only time in The Tears of Uther Pendragon. He appeared before Uther in a hallucination, dripping water. Gaius revealed that he was one of the many children that had magic that Uther executed by drowning. Uther felt either guilt for killing the child, or fear about the fact that he appeared to return from the dead. He told the hallucination to be gone, causing all the witnesses to think he was losing his mind, since they couldn't see the boy. Only Uther could see the boy because of the spell. The boy never said anything in the episode (The Tears of Uther Pendragon).