p The series 三九 seventh season began airing September 二三, 二00八, on a new 一0:00 pm EST Tuesday timeslot Steven Weber joined the cast for the first five episodes of the season as Special Agent Clark Medina, Jack 三九 s temporary replacement as unit supervisor The episodes focused as much on missing persons cases as on Medina 三九 s war against Jack, as he revealed that he had not only been p