Hurley must convince Jack to accompany him on an unspecified mission, and Jin stumbles across an old friend.

The 1999 death of a high-school debate champion, which was originally ruled a suicide, is investigated after new evidence suggests he was murdered. The probe reveals the victim received a scholarship at a top private school and died shortly after losing a debate at the competitive campus

In the third-season finale, Hank is unpleasantly surprised by a visit from Mia (Madeline Zima) and her low-life manager-boyfriend (James Frain). And circumstances lead to Karen discovering Hank’s past involvement with the young seductress. Meanwhile, Charlie must come to the realization that his relationship with Marcy may be over.

In the Season 4 finale, the police close in on the Trinity Killer, who cautions Dexter to keep away. But Dexter is willing to do whatever he can to get his man, legal or not. Meanwhile, LaGuerta and Batista must answer for their breach of ethics; and Debra becomes privy to something she’s not sure she wanted to know

Nathan and Haley get ready to move, while Clay tries to get Nathan to rehire him as his agent. Elsewhere, Brooke disapproves of how Julian responded to Alex’s crisis; Mouth and Millicent reach a turning point; and Dan makes a surprising announcement.

A year after his father’s death, Chuck deals with an issue from the past, and another car accident occurs on the Upper East side. Meanwhile, Dan and Vanessa face the new complexities in their friendship; and Jenny gets accused of assaulting a classmate

Sheldon attempts to help Penny understand Leonard’s work, and Wolowitz becomes jealous when Leonard starts hanging out with his new girlfriend.

At the dean’s end-of-semester mixer, Hank ends up mixing it up with his boss in a Civil War-style duel. Elsewhere, it’s a momentous occasion for Charlie and Marcy as their divorce becomes final on the same day that they finally sell their house

The 1999 death of a high-school debate champion, which was originally ruled a suicide, is investigated after new evidence suggests he was murdered. The probe reveals the victim received a scholarship at a top private school and died shortly after losing a debate at the competitive campus