Primeval, Series 2

Steven:
[after learning Helen has lied to him] I so badly wanted to believe you. [to Nick] BUT THAT DOESN'T PUT YOU IN THE RIGHT!

Nick:
Stephen, there's a whole army of predators down here! If even one of them makes it above ground level, there's gonna be no one left! Now if you want to help people, we have to do this!

Helen:
They're too powerful, Nick! Nothing you can do!

Nick:
Well then, you're gonna have to think of something, or else we're all gonna die! Now you brought them here, you know them! [pause]

Helen:
The siren...the creatures associate the sound with food. They'll come back to the cage room whenever they hear it.

Nick:
And if we can lock them in with the predators, then they'll destroy each other! Come on then!