Teleport control

A teleport control was a device added to the Doctor's TARDIS by the Celestial Intervention Agency. Installed at the same time they gave the Second Doctor's TARDIS a "complete overhaul" and a Stattenheim remote control as a reward for his good performance on their mission to defeat the Players in Napoleonic France, it was an addition the Doctor very much protested. (PROSE: World Game) It gave the the Time Lords "dual control" over the TARDIS. When pointing out the new addition to Jamie, the Doctor shouted "You'd think I'd never flown a TARDIS solo before!" He promised Jamie that he would complain when their mission to talk to Dastari was over. (TV: The Two Doctors)