Mister Terror

Mister Terror was a member of the Alliance of Shades, an organisation to cover up alien invasions of planets level 5 or lower. He attempted to kill the Doctor in order to get a fusion bar. He was deactivated by the Doctor when he attempted to kill him for knowing to much about an alien invasion. (DW: Dreamland)

Behind the scenes

 * The name Mister Terror is spoken only by the Tenth Doctor, and is probably just a joke. His real name is still uncertain.