Wow, I didn't see Kryptonite entering the story. But sine Lex doesn't know about Clark, or that there even is an alien out and about, there is also no reason for uniting Lex and the Kryptonite. Which leaves the only other option of having Clark stuck in Smallville while Lois is going to the ball and meeting Lex. Oh dear, what a mess. Can't wait to see how Clark's going to explain his absence. Maybe 'Honey, I've been kidnapped by aliens'? It's even almost true.
Michael
