It's amazing, the effect that mentioning the Doctor has on the people who've been his companions. For Jack, even after all this time, the thought of the man tugs at his heart and his gut, the pull as strong now after he's made his choice to walk away from the Doctor, Martha, and the TARDIS as it ever was in more than a century stuck on Earth just waiting for the Doctor to show up.

And now she's getting up, her eyes aflame with the light the Doctor kindles in his friends, her gaze fixed on his.

"Lifetimes ago," he says, with his best attempt at his habitual enigmatic, tantalizing answers. But it's not as much of a game any more.

Not now they have something so deep in common.

"I haven't seen him here," he admits. But he's still smiling.

"But you know him. You never know when he'll show up."