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. 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!"