Adam: I come from a planet called Earth. A time centuries from now. And I've come here to warn you. Someone from the future is coming to destroy Krypton.
Seg: Okay, right. Why? Why would they do that?
Adam: Because where I'm from, your grandson becomes the greatest hero in the universe. Like, ever. Unless somebody changes things to make sure that he's never born...
Seg: You all right?
Adam: I'm running out of time. Take this. You have to find the fortress. You have to save Superman.