At LAX, flight 815 lands safely enough, but after Juliet detonates the bomb, the survivors are simultaneously shown still on the island. Kate and Jin were sent to capture Sawyer who escapes from the temple and Sayid miraculously comes back to life.

Meanwhile, Sawyer is being recruited by the Man in Black, and in Los Angeles, Locke is fired from his job. The Man in Black issues an ultimatum: the others have to join him or they will die.
Ilana plans to kill Ben after she discovers that he was the one who killed Jacob. Charles Widmore returns to the island while the Man in Black sends Sawyer on a mission.
In episode 8, Richard Alpert’s arrival to the island, his immortality and his alliance to Jacob was revealed. Charles Widmore conducts a dangerous electromagnetic experiment on the island in episode 10.
Desmond was subject by Widmore to an experiment regarding electromagnetic energy, but Sayid captures him and sends him to Locke. Zhurley was given a new mission by Hurley.
Sun and Jin are reunited but the survivors split in two groups, one headed by Widmore, and the other headed by the Man in Black. In the final episode, the Man in Black plans to use Desmond to destroy the island and Jack sets out to stop him.
| Episode No | Episode Name | Directed By | Airdate |
|---|---|---|---|
| Episode 104/105 | "LA X" | Jack Bender | 2-Feb-10 |
| Episode 106 | "What Kate Does" | Paul Edwards | 9-Feb-10 |
| Episode 107 | "The Substitute" | Tucker Gates | 16-Feb-10 |
| Episode 108 | "Lighthouse" | Jack Bender | 23-Feb-10 |
| Episode 109 | "Sundown" | Bobby Roth | 2-Mar-10 |
| Episode 110 | "Dr. Linus" | Mario Van Peebles | 9-Mar-10 |
| Episode 111 | "Recon" | Jack Bender | 16-Mar-10 |
| Episode 112 | "Ab Aeterno" | Tucker Gates | 23-Mar-10 |
| Episode 113 | "The Package" | Paul Edwards | 30-Mar-10 |
| Episode 114 | "Happily Ever After" | Jack Bender | 6-Apr-10 |
| Episode 115 | "Everybody Loves Hugo" | Daniel Attias | 13-Apr-10 |
| Episode 116 | "The Last Recruit" | Stephen Semel | 20-Apr-10 |
| Episode 117 | "The Candidate" | Jack Bender | 27-Apr-10 |
| Episode 118 | "Across the Sea" | Tucker Gates | 11-May-10 |
| Episode 119 | "What They Died For" | Paul Edwards | 18-May-10 |
| Episode 120/121 | "The End" | Jack Bender | 23-May-10 |
