DOCTOR: I'm the Doctor.

MABLI: A doctor of medicine?

DOCTOR: Well, medicine, science, engineering, candyfloss, LEGO, philosophy, music, problems, people, hope. Mostly hope.

DOCTOR: You have to use your imagination. Imagine the solution and work to make it a reality. Whole worlds pivot on acts of imagination.

MABLI: I'm struggling to see much hope here.

DOCTOR: It doesn't just offer itself up; you have to use your imagination. Imagine the solution, and work to make it a reality.

DOCTOR: Too fast to chase and capture, too toxic to touch directly... It's a bit of a puzzle.

MABLI: It's gonna kill us all, isn't it.

DOCTOR: Oh, Mabli, you went there way too quick. I said a puzzle, not a death sentence. I mean, it's a bit of a challenge, and I can't quite see the solution yet, but that's life – or medicine. Patients present problems; you figure them out and come up with solutions. That's what this is: a problem to be diagnosed, medicine to be administered. You're a medic. I'm the Doctor.

DOCTOR: You're probably wondering why I called you all here. (pauses) Sorry. Bit Poirot!

RYAN: Yoss, don't panic, mate.

YOSS: I am panicking!

RYAN: Which is why I'm telling you not to!

DURKAS: I was trying to hack into my sister's medical records.

GRAHAM: Well, we've all hacked into our loved ones' confidential records at one stage or another, haven't we?

DURKAS: I'm trying to figure what to do next. Deny everything or, uh... ask you to turn a blind eye?

GRAHAM: I see your problem. Yeah. Generally, truth is always your best option.