Michael Jennings

 was interested in solving mysteries. He liked counting things. He noticed a discrepancy in the number of gnomes in the gardens. He helped at his father's work. He didn't believe that his father was dead.

Michael noticed the Sixth Doctor and Peri Brown were in his garden. He thought that his father had been turned into a gnome. He locked the Doctor in a shed, and thought he was the chief gnome, as he didn't change his trousers. The Doctor told him where his father was: in the past. (AUDIO: The Curious Incident of the Doctor in the Night-Time)