The title pretty much sums it up. Imagine alt-Clark encountering Nightfall. Unlike "our" Clark, alt-Clark doesn't get to kiss Lois goodbye because he still hasn't found her. Like "our" Clark, he flies up there to shatter the approaching asteroid and is flung back to Earth, finding himself in a crater and without his memory.
Unlike our Clark, he won't be found by Lois, and his parent's won't be there to help him regain his memory. So, he is taken to a psychiatric unit in some hospital (or whatever), and there he meets that beautiful brunette who just happens to suffer from amnesia, too. (Yeah, I mean alt-Lois.)
The rest is up to you...
