- You may be looking for the televised story of the same name.
A robot — also called an automaton by at least the Tenth Doctor (NSA: The Last Dodo) — was a mechanical device with the ability to do work without the help of a living organism. The most common type of robots are androids (a humanoid robot, such as Kamelion, who could also shape-shift). (DW: The King's Demons). However, robots also came in other forms such as dog-like (e.g. K9). (DW: The Invisible Enemy)
On many planets, robots were used as a servile labour force. Their appearance sometimes generated strong emotions in people, a condition known as Robophobia or Grimwade's Syndrome. (DW: The Robots of Death)
Although robots were mainly used for manual labour, they were occasionally used for military purposes by a wide variety of species. The most perfected of these killing machines was the Raston Warrior Robot. (DW: The Five Doctors)
Robots existed throughout the universe in many times, for many purposes. On Earth, humans used robots for work, and also for assistance and company. (DW: The Robots of Death) They were used in similar ways by the people of Sto; aboard the Starship Titanic, robots were dressed as Christmas angels, and used for information. (DW: Voyage of the Damned)
In the 51st century, Professor Marius missed his dog, so he built a computer in the form of a dog, called K9 Mark I. (DW: The Invisible Enemy) K9 travelled with The Doctor and Leela, then left The Doctor, to stay with Leela on Gallifrey. (DW: The Invasion of Time) K9 Mark I ended up on 2050 Earth some time before the destruction of Gallifrey, where he helped save the world more than once. (K9 (TV series))
K9 Mark III was also built by The Doctor and given to Sarah-Jane Smith. (K9 and Company) Sarah Jane kept the robot dog throughout the 80s, 90s and up until 2007, when he sacrificed himself to stop the Krillitane group. (DW: School Reunion) The Doctor built K9 Mark IV soon after for Sarah Jane. K9 Mark IV helped Sarah Jane seal a Black hole and fight various aliens. He helped restore the Earth to its original time-space location. (DW: Journey's End, SJA: The Mad Woman in the Attic)
Emotions and awareness
Several forms of robots have been implied to have thoughts and feelings of their own. K9 Mark I showed signs of "sulking", (DW: The Invasion of Time) and the later models did similar things. the K1 Robot showed signs of self awareness, and a desire to spare Sarah-Jane's life. (DW: Robot)
Robots also showed signs of confusion when things that contradicted facts or programming. Robots tended to show little emotion, care or understanding towards organics, and usually did as they were programmed. They often turned against their masters, but usually because they had been reprogrammed by others to do so, not because of self-awareness. It is evident that robots such as K9 or K1 had awareness, and were not just ordinary machines. Some robots also had their own desires: for example K9 desired affection and K1 desired for Sarah-Jane to live.
Creators of robots
For every robot, there was a creator, or creators, whether it was humans creating robots, or robots creating other robots. Marius for example invented K9 Mark I, and The Doctor built K9 Mark II and K9 Mark IV and, it is believed, K9 Mark III. The K1 Robot was built by Professor Kettlewell. (DW: Robot)
Morvin Van Hoff and his wife Foon Van Hoff worked in the Milk Market on Sto and they were able to fix robots. They displayed these skills by reactivating a Heavenly Host. Max Capricorn, or somebody associated with him had the Heavenly Host robots reprogrammed. (DW: Voyage of the Damned) Taren Capel was capable of reprogramming the Voc robot slaves. (DW: The Robots of Death)