Lost

Kate discovers that someone knows the secret about Aaron's true parents. Meanwhile, the dramatic shifts through time are placing the lives of the remaining island survivors in extreme peril.

Desmond searches for a mysterious woman that can help them stop the island's movements in time. Locke uncovers the person responsible for the attacks on the victims.

Jack and Ben attempt to gather the Oceanic Six for a return to the Island while the survivors left behind begin experiencing strange time shifts.

As the face-off between the survivors and the freighter people continues, the Oceanic Six find themselves closer to rescue.

As the face-off between the survivors and the freighter people continues, the Oceanic Six find themselves closer to rescue.

The face-off begins between the survivors and the mercenary team from the freighter. The Oceanic Six return to their families.

Locke finds out where Jacob's cabin is. Life on the freighter becomes dangerous as Keamy takes matters into his own hands.

Ben is forced to make a choice as Keamy and his team launch their attack on the Barracks, while a body washes ashore at the beach.

On the way to the freighter, the survivors on the helicopter hit some turbulence. This causes "side effects" for one of the passengers on board.

Kate decides to take matters into her own hands in order to get information out of the camp's hostage. However, this idea may cause a problem with the camp's new leader, Locke.

Locke's hostage may be the key to getting off the Island, so Sayid and Kate go in search of their fellow castaway in an attempt to negotiate a peaceful deal.

Four strangers arrive on the island leaving the survivors to wonder if they are really here to rescue them, or if they have a different purpose.

Feeling that their rescue is close at hand, the survivors don't know whether to believe Charlie's final message that the people on the boat are not who they claim to be.

Events reach a climax as the survivors engage the Others at the beach. Meanwhile, Jack relentlessly leads the group on toward rescue, while Charlie gets his mission underway.

When Sun discovers what happens to pregnant women on the Island, she demands answers from Juliet. Meanwhile Desmond, Hurley, Charlie and Jin try to save the life of the injured parachutist.

When Desmond has a flash of a stranger arriving on the Island, he recruits Charlie, Hurley and Jin to join him. Meanwhile, Kate seduces Sawyer after witnessing Jack and Juliet together.

Jack, Kate and Sayid return along with Juliet, who faces distrust and fear from the other survivors. At the survivors' camp, Claire is struck with a sickness.