"Yep. And it's bigger on the inside," the Doctor said, as though he were reciting something from wrote. "And it's actually a she. Very temperamental, my TARDIS, so make sure you don't insult her."

He followed Jack's movements, looking down at the extrapolator. He thought he knew where it came from, but trying to seriously consider who put it where caused a wave of pain to course through him.

"I believe you," he said. "Seems like every time I try to think of our past, all I get is pain. Should thank you, though. That extrapolator's been put through a lot of use."

He knelt next to Jack and gestured to his manipulator. "Detection device for that creature, then? Wonder why we haven't destroyed it."