Susan Duerden

After Ducky is attacked by a man claiming to have information about his half-brother who died decades ago, the NCIS team searches for the perpetrator, as Ducky recalls the final emotional days he had with his sibling. Also, with the holidays approaching, Bishop and Jake (Jamie Bamber) discuss the future of their relationship. Adam Campbell returns as "Young Ducky."

As the survivors prepare to leave the Island, a confluence of events tears apart the Oceanic 6.

Kate takes desperate measures when her custody of Aaron is threatened; as the flashes increase in frequency on the Island, the survivors - especially Charlotte - begin to feel the affects as they attempt to get to the Orchid.

Sawyer and Juliet deal with a dire medical situation, but Kate takes matters into her own hands and saves a controversial life; Kate's years off the Island are revealed including why she left Aaron behind.

Jonas and the team must go through enemy territory to bring a young bride to her groom in order to preserve a truce between two warring Afghanistan tribes. At home, Bob and Kim work together to expose a man who is linked to terrorists.