Gadget

Gadget was a robot used by the crew of Bowie Base One, operated by Roman Groom who was his creator. Before the Doctor's manipulation, it could travel at approximately two miles per hour. After this adjustment the Doctor and Adelaide were able to ride Gadget in order to escape from the Flood infected Andy Stone and Tarak Ital. The Doctor later sent it with his TARDIS key out to the TARDIS and had it bring the TARDIS into Bowie Base One. After arriving on Earth. Gadget lost contact with its control signal and shut down.

When receiving or acknowledging commands, it stated "Gadget, Gadget!"