"So who was that, anyway?" Jack asked, leaning against the side of the TARDIS.
"Rose Tyler," the Doctor pronounced with relish.
Jack blinked. "Waitwaitwait. Rose Tyler? As in the Rose Tyler? Director of Torchwood? Negotiated Earth's first treaty with an alien species? Paved the way for the First Great and Bountiful Human Empire? That Rose Tyler?"
"Don't forget vanished under mysterious circumstances. And isn't all that ancient history for you?" The Doctor unlocked the TARDIS and stepped inside.
"Time Agent," Jack reminded him, following. "Believe me, we're drilled about the Agency's history from day one." He paused. "You know, I never thought she'd be so hot."
The Doctor rolled his eyes. "Yes, because that's the important thing here." He frowned, leaning against the console and crossing his arms. "Her timelines are all weird. Hers, and that pretty-boy friend of hers who never shuts up."
Jack perked up. "Pretty-boy friend?" He backtracked. "Hold on, what you do you mean, her timelines are 'weird'?"
"Strange. They only start a bit over a decade ago, but they're also... old."
The Doctor looked at Jack. "Think 'Big Bang'."
Jack's eyebrows went up. "That's... old."
"And her friend?" Jack asked.
"That's even stranger."
"Stranger than a somehow ancient woman appearing out of nowhere a decade ago and going on to be one of the most influential people in the history of this galaxy?"
The Doctor grinned. "Yeah."