Owen: [about Gwen] That's the kind of daughter every mother must dream of. Cool as ice, packing an automatic.

Owen: [Opening narration] My name is Doctor Owen Harper, and this is my life. A life that is full of action. And violence. And work and wonder. Secrets. And sex. And love. And heartbreak. Death. My death. The death I survived. The death I'm now living through. Except.... this isn't living. Every day is the same. I get up. Get ready for work. Same as everyone else. The thing is, I'm not the same. I get to work and everyone is doing the same old thing. Babbling away about aliens, weddings. I'm not real. Three days ago I died. And they think I'm fine. But they're wrong.

Owen: [to Jack about him trying to drown himself] You were watching?
Jack: Skinny guy in tight jeans runs into water? I was taking pictures!

Owen: If you're not a figment of my imagination, then I don't know what's happening anymore. Maybe this is what a mental breakdown feels like.
Jack: You're fine. It's the rest of the world that's delusional.

Owen: It's a kind of alien egg. But don't worry, I'm going to look after you, I promise. We've got procedures for this situation.
Gwen: You mean, this has happened before?
Jack: You've heard of immaculate conception, haven't you? Well...

PC Andy: How's Rhys? Other than hungry.

PC Andy: Rhys! What are you doing here?! It's a crime scene!
Gwen: Oh come on, Andy, Rhys won't blab.
Rhys: Excuse me! I've kept loads of secrets!
PC Andy: Like what?
Rhys: Like a Time Agency based in Cardiff!
Gwen: It's not based in Cardiff.
PC Andy: Brilliant secret. I ask, you tell. Well done.

Rhys: Well if you stopped and asked me exactly what I saw in there instead of showin' off...
Jack (aside): Do I show off?
Ianto: Just a bit.
Rhys: ...You'd know that I got out by telling them I wanted a job as a delivery boy! So rather than "cock things up", I found you a way to get in! But if you can't handle that, big boy, then you can stuff it!
[Beat]
Jack: This is quite homoerotic.

Rhys: You save this city. Well done. You save the world. Whatever. What for?
Gwen: Sorry?
Rhys: Why are you doing it? What are you trying to protect? What are you fighting for?
Gwen: Because if I don't...
Rhys: Shut up, I'm talking now, right? You do it so people can live their lives. And there's nothing more important than that. Falling in love, getting married, buying flats, having kids or not. But real life, that's what you're protecting. And if you're starting to think that your shit is more important than real life, then we're not going to last very long here, love.

Tommy: [ruefully] "The war to end all wars", they said... then three weeks later you had the Second World War. After all that...

Tosh: [on video] Okay. So, if you're seeing this, I guess it means I'm, well, dead. Hope it was impressive! Not crossing the road or an 'incident' with a toaster. I just wanted to say, it's okay, it really is. Jack, you saved me. You showed me all the wonders of the universe and all those possibilities. And I wouldn't have missed it for the world. Thank you. And Owen. You never knew. I love you. All of you. And.... I hope I did good.
Jack: Now we carry on.
Gwen: I don't think I can. Not after this.
Jack: You can. We all can. The end is where we start from.
Series 3: Children of Earth

Tosh: Ianto, what have you done with Billy Davis's body?
Ianto: Um, I was just about to dispose of it, why?
Tosh: I thought of a way we can use him to get us into the Pharm. [Shows something on screen] Clever, huh?
Ianto: Oh, you are warped on the inside. How do you think of these things?
Tosh: I'll take that as a compliment.

Tosh: No I can't just hook something up! The entire telephone network is down!
Owen: What about a mobile connection?
Tosh: [annoyed] The entire. Telephone. Network. Is down!
Ianto: Mobiles, landlines, tin cans with bits of string - everything, absolutely everything! No phones, phones all broken. [mimics telephone] Hello? Anyone there? [normal] No, 'cause the phones aren't working!

Tosh: Who are you?
Jack: Nobody. I don't exist... and for a man of my charisma, that's quite an achievement.

Toshiko Sato: [hacking into a military database] Come on, guys, that wasn't even difficult. You disappoint me.
Ianto Jones: It's almost obscene what you do to security systems.