"Doctor..." Jack started to interrupt as the Doctor went off on his tangent. "Doctor" he repeated with a slight smile.

"Doctor you're losing me. I've got no idea what you're talking about." he laughed slightly. "What's the White Guardian? You're going to have to help me catch up here a little."

Jack could usually be counted on a little more knowledge of the universe at large than the Doctor's usual companions. Or at least more than people like Rose and Martha. But for everything he did know the Doctor knew a hundred things more, and sometimes Jack was reminded of just how in the Doctor's shadow he was.

"Start again?"