Jack wants to set things right on the island but is met with strong resistance by those close to him. In the two-part season finale of "Lost", Jack's decision to put a plan in action is facing a roadblock and Locke assigns Ben on a difficult task.
The May 13 episode called "The Incident" will be a two-hour event on ABC before the show wraps up. Many hints have been released in the past few months regarding this finale including a death that reportedly is from a major character.
While one (or some) are leaving, many will also return, from the death. Michael Emerson, who plays Ben, had confirmed "We see some people from the past. It keeps us speculating why certain people seem to be holding on and revisiting the living in some interesting ways." One of these 'ghosts' is most probably Sayid's wife Nadia who was tragically murdered.
Additionally, sightings of the younger versions of Kate, Sawyer, and Juliet will also be in the finale along with the final revelation of the Goliath four-toed statue. "She's Taweret, the goddess of childbirth," Michael mentioned previously.