G is for... Gadget

Gadget was the name given by its operator to the service robot which accompanied the mission to establish the first manned base on Mars - Bowie Base One. Roman Groom controlled the robot through a pair of remote control gauntlets, which meant that it would mimic his movements. Groom had also programmed it to say its name, which the Doctor found annoying. When he visited the planet on 21st November, 2059, the Doctor was captured by Gadget and taken to the base. Here, he discovered that this was the day on which it was destroyed with all hands. The cause was an infection of the crew by the water-borne Flood. When being pursued by two infected crewmen, the Doctor used his sonic screwdriver to boost Gadget's speed, so he and Captain Adelaide Brooke could outrun them. Later, when the base's spaceship had been destroyed and it looked like the Doctor might be trapped inside the complex, which was rigged to self-destruct, he gave the robot his key to the TARDIS and sent it to fetch the ship. Gadget then travelled to Earth in the TARDIS with the Doctor and the survivors. Once out of range of its control mechanisms, however, it shut itself down.

Appearances: The Waters of Mars (2009).