Journeyman

Langley: The rules haven't changed much since Einstein. Ultimately Whether it's wormholes or warp drives, time travel requires you to go 186,000 miles per second. Dan: The speed of light. Langley: That's the rub because, so far, nothing has demonstrated an ability to do that. Dan: What about tachyons? Langley: Theoretical particles never proven to exist. Dan: So, time travel's impossible. Langley: No, just not proven. Five hundred years ago, we knew Pluto didn't exist. Five years ago, we knew it was a planet. Now, we know it's not. Did Pluto change? No. Did our understanding of Pluto? Yes.

Dan: Imagine. Uncovering the identity of Dylan McCleen. Katie: Sounds like you're enjoying yourself. Dan: It has its adrenaline moments, that's all. Katie: And the Livia part? Dan: No. Katie: You're an adrenaline guy, Dan. You liked the action when you were gambling. Maybe you want two women in different time zones. Dan: Katie... Katie: No, I mean, you know, technically, it wouldn't be cheating if it's in the past. I was sleeping with Jack, maybe you should sleep with Livia back there. Dan: So, if I'm with Livia back there, you can start sleeping with Jack here? What, not funny?

McCleen: Do you know where we are? Dan: I don't know when we are.