Martha looked out over Cardiff Bay. "Time was, every single one of these people knew your name. Now they've all forgotten you."
"Good." The Doctor nodded.
They both saw Jack look towards the Millennium Fountain, at his wife, smiling and waving once more. "Back to work." He said and jumped the railing they'd been leaning against.
"I really don't mind, though." The Doctor smiled at him and then at Mariah, waiting for Jack. "Come with me… both of you."
"Had plenty of time to think, that past year. The year that never was." Jack looked down and then back at Mariah. "And I kept thinking about her…about what he made her do to protect me…even when he found out she couldn't bare him a child…"
"Why was that?" Martha asked.
"Because," Jack smiled a little. "She was already pregnant with mine." He now smiled broadly, and proudly. "Like you said, Doctor. Responsibility. I have a chance to set things right now, for her."
"Defending the Earth." They all heard Mariah's voice in their minds and looked at her, giving them each a cheeky wink and a smile.
"Can't argue with that." Jack grinned, jumping a moment later as the Doctor grabbed his arm. "Hey, I need that!"
"I can't have you walking round with a time-travelling teleport, you could go anywhere." The Doctor paused, a slight warning look passed between the two men. "Twice. The second time to apologise."
"And what about me? Can you fix that? Will I ever be able to die?" Jack inquired hopefully.
"Nothing I can do." The Doctor replied with a half-smile. "You're an impossible thing, Jack."
Jack laughed. "Been called that before." He saluted his two companions. "Sir. Ma'am." He winked at Martha, took two steps away and turned back. "But I keep wondering, what about ageing? Cos I can't die, but I keep getting older, the odd little grey hair, you know? What happens if I live for a million years?"
"I really don't know." The Doctor half laughed.
"Okay," Jack chuckled softly. "Vanity, sorry, yeah. Can't help it. Used to be a poster boy! When I was a kid, living in the Boeshane Peninsula, tiny little place, I was the first one ever to be signed up for the Time Agency. They were so proud of me." The Doctor nodded at Jack as he made up his mind. "The Face of Boe, they called me."
With an overjoyed smile, Jack bounded away from the Doctor and Martha and back into the arms of his beloved – and probably as immortal as he was – half Time Lord wife.
Finis'