"I don't want to be with you." In a series where there is more than one of everything, where a shadow separates two similar worlds, what defines us as individuals? If we are identical on a cellular level with our twin from an alternate reality, are we the same or different? Do the little differences--being more quick to smile, still being married--separate us or are we still inherently the same underneath the surface? This week's sensational and eerie episode of Fringe ("Marionette"), written by Monica Owusu-Breen and Alison Schapker and directed by Joe Chappelle, examined the fallout from Olivia's return to her universe and the emotional destruction left in the wake of her alternate reality counterpart. But it was the way in which this week's heartbreaking installment dealt with matters of animus, of soul, of life force, that left me asking those questions. Peter didn't notice that the woman he was romantically involved with was someone else. Y