The Doctor and Okdel in “Doctor Who and the Silurians”

But I still don't understand why you stayed down here.

The hibernation mechanism was faulty. It did not function until a new energy source appeared.

The power station at the research centre?

Yes. We are now able to drain off its energy. But soon we shall revive our civilisation, and reclaim the Earth for ourselves.

No, you mustn't! Otherwise there'll be the most terrible war! But if you trust me, I think I can persuade the humans that you are prepared to live with them on this planet in peace.

There is not room for both civilisations.

Oh yes, I think there is. You see, your people are used to living in extreme heat, whereas these areas on Earth are of little interest to man. I believe, with your advanced technology, that you could build cities in parts of the world that man has hitherto completely ignored.

[pauses in thought for a moment] Would your people agree to this?

Well, they're not my people. But I think I could convince them, on the condition that you release those trapped men first.

Those apes have only shown hostility to us!

And you to them! Someone has to make a move, otherwise this whole thing will end up in complete catastrophe.