Season 1, Episode 12
The world is living in an alternative timeline that's starting to decay around them. Jack and the scientists at Global Dynamics must find a way to reverse it even if it means those years will never happen.
Jack: What's a matter, Jo? Scare of a little trans-dimensional radiation?
Nathan: So let me get this straight. I get fired for cutting corners on the artifact but Henry gets to play with the space-time continuum?
Allison: Aren't you even a little afraid to lose me? To lose us?
Jack: Listen to me. There is no time, no space, no way that we don't end up together. You just have to have a little faith.