Eli Vance: "Why didn't they listen? We tried to warn them."
Scientist 2: "I never thought I'd see a resonance cascade, let alone create one."
Eli Vance: "Gordon, you're alive! Thank God for that hazard suit. I'm afraid to move him and all our phones are out. Please get to the surface as soon as you can and let someone know we're stranded down here. You'll need me to access the retinal scanners. I'm sure the rest of the science team will gladly help you."

Come in, Cooper! Do you copy? Forget about Freeman, we're abandoning the base. If you have any last bomb targets, mark them on the tactical map. Otherwise, get the hell out of there! Repeat, we are pulling out and commencing airstrikes, give us targets or get below!

Gordon Freeman - it is you, isn't it? The Science Team has been tracking your progress with the Black Mesa security system. Unfortunately, so has the military. That suit of yours is full of tracking devices. Still, it's better than going naked in this place. It's cold in there, and you'll have to hurry. It could sap your suit power in a matter of moments! If you're bent on reaching the Lambda Complex, then you'll want to keep to the older, industrial areas where the security system is full of holes. It's worked for me, so far.

I didn't sign on for this shit. Monsters, sure, but civilians? Who ordered this operation anyway?

Eat this, you outer-space octopus!

Gordon Freeman, in the flesh - or, rather, in the hazard suit. I took the liberty of relieving you of your weapons. Most of them were government property. As for the suit, I think you've earned it. The borderworld, Xen, is in our control, for the time being... thanks to you. Quite a nasty piece of work you managed over there; I am impressed. That's why I'm here, Mr. Freeman. I have recommended your services to my... employers, and they have authorized me to offer you a job. They agree with me that you have limitless potential. You've proved yourself a decisive man so I don't expect you'll have any trouble deciding what to do. If you're interested, just step into the portal and I will take that as a yes. Otherwise, well, I can offer you a battle you have no chance of winning... rather an anticlimax after what you've just survived. Time to choose...

We now have direct confirmation of a disruptor in our midst, one who has acquired an almost messianic reputation in the minds of certain citizens. His figure is synonymous with the darkest urges of instinct, ignorance and decay. Some of the worst excesses of the Black Mesa Incident have been laid directly at his feet. And yet unsophisticated minds continue to imbue him with romantic power, giving him such dangerous poetic labels as the One Free Man, the Opener of the Way. Let me remind all citizens of the dangers of magical thinking. We have scarcely begun to climb from the dark pit of our species' evolution. Let us not slide backward into oblivion, just as we have finally begun to see the light. If you see this so-called Free Man, report him. Civic deeds do not go unrewarded. And contrariwise, complicity with his cause will not go unpunished. Be wise. Be safe. Be aware.

Dr. Freeman, you really shouldn't be out there. At the moment of synapse, as I teleport, this chamber will be bathed in deadly particles that have yet to be named by human science. Perhaps when I have the leisure to do the work myself, I'll name one after you. That way you won't be completely forgotten.
When the singularity collapses, I will be far away from here. In another universe, as a matter of fact! You, on the other hand, will be destroyed in every way it is possible to be destroyed - and even in some which are essentially impossible!

I'd like to take a moment to address you directly, Dr. Freeman. Yes. I'm talking to you, the so-called One Free Man. I have a question for you. How could you have thrown it all away? It staggers the mind. A man of science, with the ability to sway reactionary and fearful minds toward the truth, choosing instead to embark on a path of ignorance and decay. Make no mistake, Dr. Freeman. This is not a scientific revolution you have sparked... this is death and finality. You have plunged humanity into freefall. Even if you offered your surrender now, I cannot guarantee that our benefactors would accept it. At the moment, I fear they have begun to look upon even me with suspicion. So much for serving as humanity's representative. Help me win back their trust, Dr. Freeman. Surrender while you still can. Help ensure that humanity's trust in you is not misguided. Do what is right, Dr. Freeman. Serve mankind.

Dr. Isaac Kleiner: We can't leave without Lamarr. She's around here somewhere...
Alyx Vance: Come on, Dr. Kleiner. We can find you another pet headcrab.
Dr. Isaac Kleiner: No! There's only one Hedy!

Well, Gordon, I see your HEV Suit still fits you like a glove. At least, the glove parts do.

Man of few words, aren't you?

Great job, Gordon! Throwing that switch and all, I can see your MIT education really pays for itself.

Dr. Eli Vance: A-hem! Alyx, why don't you take Gordon along and give him some practice with the Gravity Gun?
Alyx Vance: Sure. C'mon, Gordon. Let's go have some fun.
Dr. Judith Mossman: The Zero Point Energy Field Manipulator is not a toy, Alyx.
Alyx Vance: Ugh, let's get outta here.

Welcome. Welcome, to City 17. You have chosen, or been chosen, to relocate to one of our finest remaining urban centers. I thought so much of City 17, that I elected to establish my administration, here, in the citadel, so thoughtfully provided by our benefactors. I am proud to call City 17 my home. And so, whether you are here to stay, or passing through to parts unknown, welcome, to City 17. It's safer here.