A Child Problem

While on a hunting trip, Merlin, Arthur, and the Knights run into a sorcerer. He attacks Merlin, surprising the Knights. He is turned into a child. When taken to Gaius, they realize Merlin is stuck that way. Uther, not realizing that he is Merlin, takes in Merlin as his ward. Merlin has forgotten almost everyone, and only remembers glimpses of Arthur and the Knights. How will they react when Merlin uses magic?