Jack's decision to put a plan in action in order to set things right on the island is met with some strong resistance by those close to him, and Locke assigns Ben a difficult task.

Jack Shephard's decision to put a plan in action in order to set things right on the island is met with some strong resistance by those close to him, and John Locke recruits Ben Linus to kill Jacob together.

Jack and Kate find themselves at odds over the direction to take to save their fellow island survivors, Locke further solidifies his stance as leader of "The Others," and Sawyer and Juliet come under scrutiny from the Dharma Initiative.

On the 100th episode milestone for the series, the time of reckoning has begun when Daniel Faraday comes clean regarding what he knows about the island.

Suspicions about a possible breach intensify after Ben is taken from the infirmary, and a reluctant Miles is forced to work with Hurley when he's asked to deliver an important package to a top Dharma official.

To atone for sins of the past, Ben must attempt to summon the smoke monster in order to be judged

Kate goes to extreme measures to save Ben's life when Jack refuses to help. Meanwhile, Kate begins to tell the truth about the lie in order to protect Aaron.

Things begin to unravel when one of the survivors goes rogue and takes matters into their own hands -- risking the lives of everyone on the island (source: ABCmedianet).

Sawyer is forced to further perpetuate his lie in order to protect some old friends who drop in unannounced (source: ABCmedianet).

Sawyer perpetuates a lie with some of the other island survivors in order to protect themselves from mistakes of the past.

Locke's mission off the island as Jeremy is revealed.

The members of Oceanic 6 discover how to get back to the island, but not all of them want to return.

Locke shoulders the burden of ending the island's increasingly violent movements through time; Ben is stymied in his efforts to reunite the Oceanic 6 and bring them back to the island.

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

Desmond looks for a woman who might be the key to helping Faraday stop the island's unpredictable movements through time; Locke finds out who has been attacking the survivors.

Hurley and Sayid are on the run from the cops after stumbling into trouble at the safehouse; the island survivors come under attack by unknown forces; and an old friend offers some shocking advice to Kate in order to ensure that "the lie" remain a secret.

Several of the Oceanic Six survivors come to grips with their need to return to the island... on their own terms.