Well, I might know a bit about space and time traveling. Not much, just a bit.

[ Only, he knows more than a bit, so much more than just a bit, but it wouldn't do to just launch off on a tangent about everything he knows about the subject. ]

I'd agree with you, that this place is impossible, but I've always been rather fond of that. The impossible, I mean.

[ Whoever this Bruce Banner is, he's definitely piqued the Doctor's interest. ]

Hello, I'm the Doctor. And if it's all the same to you, I think I'd like to meet you in person. Nothing against talking like this, of course. It's just that you seem to know a lot about wormholes, and dimensions, and I can't help but wonder, how is it you know so much?

[ Fair warning, Bruce, the Doctor has a lot of questions, so any conversation with him might wind up taking a very long time. ]