Jamie had told him that he'd been on the ship before, despite the fact that he had no recollection of it, but the Doctor hadn't really thought about the fact that there were people on the ship that knew him when he didn't even remember meeting them. For the consummate time traveller, it was usually the other way round.

The Doctor grinned at the prospect of another challenge, starting to consider the problem as he produced a pair of glasses from a pocket and popped them on.

OOC: Take pity on a mun who is nowhere near as smart as her character!