Graphon Narmolis

Graphon Narmolis, a shape-shifting criminal, was on the Shadow Proclamation’s most wanted list. From the planet Speldron he arrived on Earth where, assuming the identity of a colourful pencil, he gained influence over the schoolgirl, Janie, whom he used to hide his whereabouts.

Unfortunately for him he was tracked by the Eleventh Doctor and Amy Pond to Janie’s school, where the Doctor's mind, resistant to his psychic influence, enabled his recapture. (DWAM: Pencil Pusher)