Torchwood, Series 4: Miracle Day

Esther:
[about the Null Field] How does it work?

Jack:
I can't tell you. That's the point. Just listen to me. I knew this stuff the second I saw it. Yes, it's alien technology. The only examples of it on Earth were in the Torchwood Hub. They were buried in the ruins.

Esther:
But Angelo had people watching.

Jack:
He must have salvaged it, knowing the Miracle was coming.

Esther:
So what did he do? Trigger it with your DNA or something?

Jack:
Maybe that was revenge, or maybe giving me a clue. But there's only one course of action left now. You have to get me out of here.

Rex:
Are you crazy?

Jack:
Turn your head.

Rex:
Jack, listen to me. The CIA is not the enemy. That's why I brought them in. Don't you understand? You don't-

[an agent walks past, they quickly pretend to be examining the lattice]

Jack:
Keep your head down. Be calm.

Rex:
Look, you don't need to run anymore, okay? We can protect you.

Jack:
There's a reason why Torchwood was secret. We kept things hidden from the human race. This technology is a science the world should never know.

Esther:
How can you know that?

Jack:
I know, Esther, because I've seen the future. I've walked the future world and breathed its air. And this technology would send it to damnation. Just imagine the stealth technology of a null field hiding bombs, hiding planes, shielding one side from radiation while the other side burns. This thing would be the end of us. This timeline would be terminal.

Esther:
He's right.

Rex:
Whose side are you on?!

Esther:
Even if the government... Even if the government had this one panel and they put people inside and they died, it's the same thing as the ovens. It's control over life and death, and we've seen that that doesn't work.

Jack:
But you trust me, don't you? Both of you? After all we've done? Please, I'm begging you, get me out of here. Look, this is the Alpha plate. Without it this is just a bunch of metal. You've got to get me and the plate away from this house.

Rex:
Jack, listen to me. We can't, okay? We are the CIA and this is a genuine CIA operation.

Jack:
This is history, Rex. This is everything. Please, get me out.