Robot
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If you are looking for the story of the same name see: DW: Robot (TV story).
A robot is a mechanical device with the ability to do work without the help of a living organism. The most common type of robot is an android (a humanoid robot, e.g. Kamelion, who could also shape-shift). (DW: The King's Demons). However, robots also come in various forms such as dog-like (e.g. K-9). (DW: The Invisible Enemy)
On many planets, robots were used as a servile labour force. Their appearance sometimes generated strong emotions among people, a condition known as Robophobia or Grimwade's Syndrome. (DW: The Robots of Death)
They were powered in many different ways such as by Black light. (DW: Four to Doomsday)
Although programmed with several hundred safety protocols inhibiting violence, a skilled mechanic can bypass these (see Taren Capel), allowing the robot to wreak havoc. (DW: The Robots of Death)
Although robots were mainly used for manual labour, there have been occasions when they have been used for militant purposes by a wide variety of species. The most perfected of these killing machines was the Raston Warrior Robot. (DW: The Five Doctors)
Races known to use robots for militant purposes include: Cybermen, Dominators, Time Lords (Death Zone) and Humans.
Smilers are robots aboard the Starship UK, that teach children and are also the law enforcement on the ship. (DW: The Beast Below)