I always hated his use in the show because I thought the premise was stupid. If he could move through time as they have him doing why didn't he go back and stop himself from meeting Tempus so that problem would be solved. There would have been no threat by Tempus to Clark. It just didn't make any sense except as a character to drive Lois and Clark and the rest of us crazy.
Don't even get me started on the "Curse" if they had sex story line.
