Locke puts his plan into action, which could liberate him from the island.
Locke devises a new strategy; Jack's group searches for Desmond.
Locke's motives are finally explained.
When asked to perform a difficult task, Jack must decide whether or not to trust Locke.
Alliances are forged and broken as Locke and Jack merge their camps.
Hurley agonizes over what the group's next move should be; Locke is curious about the new arrival in his camp.
Desmond wakes up and realizes he is back on the island.
Sun and Jin continue to seach for each other; Locke confronts his enemy.
Richard must make a difficult decision.
John Locke assigns Sawyer a mission.
Ben deals with the consequences of an uncovered lie.
Sayid faces a difficult decision; Claire sends a warning to the temple inhabitants.
Hurley tries to persuade Jack to go with him on an unspecified mission; Jin has an encounter with an old friend.
Locke goes in search of help to further his cause.
Kate finds herself on the run; Jack must do something that may endanger a friend's life.
The aftermath from the detonation of the bomb is revealed.
Download the TV Guide app for iPhone, iPad and Android!