"Headmaster: [to a young Alan, about his note-passing] You and your friend solve maths problems during maths class because the maths class is too dull?"

"Christopher Morcom: Sometimes it is the people no one imagines anything of who do the things no one can imagine."

"Matthew Goode - Hugh Alexander"

"Alastair Denniston: Double agents are such bastards. Isolated loners. No attachments to friends or family. Arrogant. Know anybody like that?"

"Sometimes it is the people no one imagines anything of who do the things no one can imagine."

"Heil Hitler. Turns out that's the only German you need to know to break Enigma."

"Think of it. A digital computer. Electrical brain."

"Of course machines can't think as people do. A machine is different from a person. Hence, they think differently. The interesting question is, just because something thinks differently from you, does that mean it's not thinking?"

"No one normal could have done that. Do you know, this morning... I was on a train that went through a city that wouldn't exist if it wasn't for you. I bought a ticket from a man who would likely be dead if it wasn't for you. I read up on my work... a whole field of scientific inquiry that only exists because of you. Now, if you wish you could have been normal... I can promise you I do not. The world is an infinitely better place precisely because you weren't."

"Charles Dance - Cdr. Alastair Denniston"

"Was I God? No. Because God didn't win the war. We did."

"I know it's not ordinary. But who ever loved ordinary?"

"Mark Strong - Maj. Gen. Stewart Menzies"

"Brad Hawkins - Jim"

"Are you paying attention? Good. If you are not listening carefully, you will miss things. Important things. I will not pause, I will not repeat myself, and you will not interrupt me. You think that because you're sitting where you are, and I am sitting where I am, that you are in control of what is about to happen. You're mistaken. I am in control because I know things that you do not know. [pause] What I will need from you now is a commitment. You will listen closely, and you will not judge me until I am finished. If you cannot commit to this, then please leave the room. But if you choose to stay, remember you chose to be here. What happens from this moment forward is not my responsibility. It's yours. Pay attention."

"Some people thought we were at war with the Germans— incorrect. We were at war with the clock. Britain was literally starving to death. The Americans sent over 100,000 pounds of food each week, and every week the Germans would send our desperately needed bread to the bottom of the ocean. Our daily failure was announced at the chimes of midnight. And the sound would haunt our unwelcome dreams."

"Bill Wise - Steve Evans"

"Do you know why people like violence? It is because it feels good. Humans find violence deeply satisfying. But remove the satisfaction, and the act becomes... hollow."

"Tom McTigue - Mr. Turlington"

"When people talk to each other, they never say what they mean. They say something else and you're expected to just know what they mean."

"Allen Leech - John Cairncross"

"Matthew Beard - Peter Hilton"

"Rory Kinnear - Detective Robert Nock"

"Alex Lawther - Young Turing"

"Jack Bannon - Christopher Morcom"

"Progress — not Perfection."

"A top-secret life."

"You do not know this man. Yet he has changed our lives."

"Unlock the secret. Win the war."

"Behind every code is an enigma."

"Tuppence Middleton - Helen"

"James Northcote - Jack Good"

"The true enigma was the man who cracked the code."

"Steven Waddington - Supt Smith"

"Sometimes it’s the people no one imagines anything of who do the things that no one can imagine."

"Charlie Sexton - Jimmy"

"Ellar Coltrane - Mason Evans Jr."

"Patricia Arquette - Olivia Evans"

"Ethan Hawke - Mason Evans Sr."

"Victoria Wicks - Dorothy Clarke"

"Lorelei Linklater - Samantha Evans"

"David Charkham - William Kemp Lowther Clarke"

"I finally figured it out. It's like—when they realized it was gonna be too expensive to actually build cyborgs and robots. I mean, the costs of that were impossible. They decided to just let humans turn themselves into robots. That's what's going on right now. I mean, why not? There're billions of us just laying around, not really doing anything. We don't cost anything. We're even pretty good at self-maintenance and reproducing constantly. And as it turns out, we're already... biologically programmed for our little cyborg upgrades. I read this thing the other day about how... Like, when you hear that ding on your inbox, you get like a dopamine rush in your brain. It's like we're being chemically rewarded for allowing ourselves to be brainwashed. How evil is that? We're fucked."

"Bill Welbrock: You don't like me much, do you Mason? [pause] That's okay, neither do I."

"Nicole: You know how everyone's always saying seize the moment? I don't know, I'm kind of thinking it's the other way around, you know, like the moment seizes us."

"Anastasia Mousis as Jenny"

"One family's life. Everyone's story."

"Alex Veadov as Tevi"

"James Wilcox as Pederson"