Nostic

The Diagnostic robot, or Nostic for short, was a caretaker robot on the colony ship the World. It saved Zoe Heriot after collision between the World and The Doctor's TARDIS. It demanded that Zoe fix the ship. It later saved Zoe and the Second Doctor from the sleepers. It later relayed a message to Jamie to stop generating power from Zoe. (AUDIO: The Wreck of the World)