"There you go! I can taste it! Oestrogen. Definitely oestrogen. Take the pill, flush it away, it enters the water cycle. Feminizes the fish. Goes all the way up into the sky then falls all the way back down onto me. Contraceptives in the rain. Love this planet. Still, at least I won't get pregnant. Never doing that again."

"And before we go any further, who the hell orders pizza under the name of "Torchwood"?"

"You people and your quaint little categories."

"You need to figure out who's side you're on here, because if you don't know, you're not gonna make it out of this alive."

"If you've got forever, you don't notice the flecks in the concrete, or bother to touch the bricks... You send your friends into danger, knowing the stakes aren't the same for you, that you might get them killed - while you walk away unscathed."

"You've heard of immaculate conception, haven't you? Well..."

"You have no idea what it felt like, coming back to life and knowing the world was empty...because you'd gone!"

"The Doctor Dances [1.10] (28 May 2005)"

"Day One [1.2] (22 October 2006)"

"And the good thing is, he's not dead for long. I GET TO KILL HIM AGAIN!"

"Sleeper [2.2] (23 January 2008)"

"...He is dashing, you have to give him that."

"You always remember what you kill - Don't you, Jack?"

"Reset [2.6] (13 February 2008)"

"The problem seems to be an American with no sense of timing or fashion."

"It's not... Men, it's...it's just him. It's only him."

"I swear to you: If your duty is to protect the state above and beyond any other authority, then the one person you need right now is Jack Harkness."

"He likes to call himself Captain Jack, but I'm not buying it."

"I could go on all Jack's stag parties in one night!"

"Captain Jack Harkness. I thought it was very refreshing to see such a lead character. He’s omnisexual and explores men, women, cupboards… You name it, he explored it."

"In terms of Jack's sexuality it was a really bold thing that Russell [T Davies] did putting him right in the middle of a show at seven o'clock. For young people to see a character who is such a positive role model, who is honest and decent and good and a hero, and for him to have a sort of non-defined sexuality I think it's a really important thing to see. Your sexuality doesn’t make you a good or bad person. And John was really keen on that too, he was really excited about the opportunity to do that I think."

"I've kind of made Jack a hero that I would like to have looked up to as a little boy because as a little boy, I knew I was gay but I didn't know what it was. Didn't know who to talk to about it. … I wanted kids to like him, and I wanted women, men, I wanted everyone to like him. But first I wanted people to hate him. I wanted them to think he was arrogant and pushy and too sure of himself. And I wanted them to follow the arc of the change he went through in the final episodes of Doctor Who."