The sixth and final season of LOST began airing on February 2, 2010. The primary story line continues after the detonation of the hydrogen bomb with all the main characters returned to 2007 unharmed, but still on the Island. Locke, now revealed to be The Man in Black continues trying to gather all the remaining survivors - mostly drawn to the Island by Jacob for the purpose of selecting one of them to replace him as the protector of the Island.
This season introduces the concept of the "flash-sideways" which is later revealed to be an afterlife dream-state. It is a dreaming state which the castaways have created for themselves before "moving on" to a more permanent afterlife setting. The "flash-sideways" presents events as they would have happened if there were no crash and major events in their lives had happened differently. This "flash-sideways" timeline cannot be truly said to be a flash-sideways, a flashback or a flash-forward. It exists outside of time as we know it and serves as a limbo or temporal afterlife until the characters are ready to continue their journey together.
| Lost - Final Chapter
The sixth season Lost special, which provided an insightful glimpse into the lives of the survivors of Oceanic Airlines Flight 815 and the history of the island.
| LA X
After the detonation of the hydrogen bomb, two timelines are revealed. The original timeline which has been the focus of the main story arc throughout the series, and an afterlife timeline which presents events as they may have occurred if there were no Island, and therefore no plane crash. In the original timeline, we follow Jack and his group to a temple in an attempt to save Sayid's life. Meanwhile, Ben and The Others reel at the increasing danger posed by The Man in Black posing as a resurrected John Locke. In the afterlife timeline, Oceanic Flight 815 lands safely in Los Angeles.
| What Kate Does
Following Sayid's miraculous resurrection, Jack and company are left at the mercy of the Others at the Temple, and left clueless to the island inhabitants' true intentions. Meanwhile Kate pursues a grieving Sawyer. Jin finds Claire who is radically different than the last we saw her. In the afterlife timeline we follow Kate after she hijacked Claire's taxicab. Oddly the two form a bond of trust and they both end up helping each other.
| The Substitute
The Man in Black masquerading as John Locke continues his mysterious strategy following the death of Jacob, and attempts to incorporate both Richard Alpert and Sawyer into his plans. Meanwhile, Ben's group performs a funeral (of sorts) for the real John Locke. In the afterlife timeline, we follow John who accepts a job as a substitute teacher at the same school as Dr. Benjamin Linus, after some soul searching and acceptance of his paralysis.
The Others in the Temple are on high alert at the approach of the Man in Black. Jack and Hurley follow the instructions of Jacob to a lighthouse, in order to assist with the approach of an unknown visitor. In the afterlife timeline Jack is shown to have a strained relationship with his son which he wants to heal.
Ilana and her team arrive at The Temple and begin their search for candidates. The Man in Black issues a warning through Sayid to follow him or die. Those who don't follow are massacred at sunset. In the afterlife timeline, Sayid runs afoul of Martin Keamy who holds a debt over his brother Omer.
| Dr. Linus
Ben, revealed to be Jacob's murderer, is forced to dig his own grave, and finds redemption. Hurley, Jack and Richard have an intense conversation at the Black Rock. In the afterlife timeline Dr. Benjamin Linus, a high-school European history teacher, makes a failed attempt at a power-grab against the principal of his school, but succeeds in helping his star pupil Alex Rousseau greatly.
Sawyer is sent to Hydra Island by the Man in Black to scout the area. "Anthony Cooper his followers busy and tries to maintain order. In the afterlife timeline, Detective James Ford continues his search for Anthony Cooper, and is fixed up on a date with Charlotte, by his partner Miles.
| Ab Aeterno
| The Package
Sun is growing more impatient to find Jin. When approached by Locke, she flees and ends up with a head injury which causes her to lose her English. In the afterlife timeline, an unmarried Jin and Sun are sent to Los Angeles, ostenibly to deliver a package. The recipient of the package, however, is a hired killer who is targetting Jin.
| Happily Ever After
Desmond is returned to the island by Charles Widmore. It is discovered that he has an unusual gift that will prove useful to any one of the factions left on the Island. In the afterlife timeline, Desmond is inadvertently shown the reality of his situation by a suicidal Charlie Pace. This notion becomes a full epiphany when he finds Penny.
| Everybody Loves Hugo
Hurley tries to stop Richard who has decided that the Ajira plane must be destroyed. "Locke" tries to deal with Desmond who is retrieved from Hydra by Sayid. In the afterlife timeline, Hurley, in search of a girlfriend, accidentally meets an old friend who remembers him and tries to spark his memory.
| The Last Recruit
The Candidates merge their groups with "Locke's" group. Then split up again. Widmore's group becomes aggressive. In the afterlife timeline, the various characters are being drawn together under seemingly unfortunate circumstances.
| The Candidate
The Man in Black drives the candidates toward the Ajira Plane with the help of Jack and Sayid. When that proves too dangerous, they make for the submarine. The Man in Black betrays everyone by tricking them onto the submarine with a ticking bomb, which ends up killing several main characters. In the afterlife timeline Jack and Locke talk about John's paralysis. Jack believes he can heal Locke. Locke doesn't want to be healed.
| Across the Sea
The origins, objectives and relationships of the Man in Black and Jacob are revealed. Several other long running mysteries of the island in the series are also revealed.
| What They Died For
The Man in Black regroups after the some of the Candidates survive the submarine explosion. Jack volunteers to be the protector of the Island. In the afterlife timeline, Desmond continues to manipulate events that draw the passengers of Oceanic Flight 815 together. It is revealed that Hugo is assisting him.
| The End
The series draws to a conclusion with a battle between the Man in Black and Jack with the assistance of Desmond. Some survivors escape the Island, and other choose to remain. The afterlife timeline is explained and draws to a conclusion.
- Matthew Fox as Jack Shephard
- Jorge Garcia as Hugo "Hurley" Reyes
- Terry O'Quinn as John Locke
- Naveen Andrews as Sayid Jarrah
- Ken Leung asMiles Straume
- Emilie de Ravin as Claire Littleton
- Evangeline Lilly as Kate Austen
- Michael Emerson as Benjamin Linus
- Jeff Fahey as Frank Lapidus
- Josh Holloway as James "Sawyer" Ford
- Daniel Dae Kim as Jin-Soo Kwon
- Yunjin Kim as Sun-Hwa Kwon
- Nestor Carbonell as Richard Alpert
- Zuleikha Robinson as Ilana Verdansky
- Henry Ian Cusick as Desmond Hume
- Sam Anderson as Bernard Nadler
- L. Scott Caldwell as Rose Nadler
- Dominic Monaghan as Charlie Pace
- Elizabeth Mitchell as Juliet Burke
- Ian Somerhalder as Boone Carlyle
- Francois Chau as Pierre Chang
- Jeremy Davies as Daniel Widmore
- Fionnula Flanagan as Eloise Widmore
- Maggie Grace as Shannon Rutherford
- Rebecca Mader as Charlotte Lewis
- Sonya Walger as Penelope Milton
- Cynthia Watros as Elizabeth "Libby" Smith
- John Terry as Christian Shephard
- Kimberley Joseph as Cindy Chandler
- Sheila Kelley as Zoe
- Mark Pellegrino as Jacob
- Kenton Duty as Young Jacob
- Mickey Graue as Zach
- Kiersten Havelock as Emma
- Fred Koehler as Seamus
- Dylan Minnette as David Shephard
- Daniel Roebuck as Leslie Arzt
- Hiroyuki Sanada as Dogen
- John Hawkes as Lennon
- Dayo Ade as Justin
- Anthony Azizi as Omar
- Kevin Durand as Martin Keamy
- Andrea Gabriel as Nadia
- Neil Hopkins as Liam Pace
- Fredric Lehne as Edward Mars
- Pono as Vincent
- Tania Raymonde as Alex Rousseau
- Katey Sagal as Helen Norwood
- Titus Welliver as The Man in Black
- Sean Whalen as Neil "Frogurt"
- Bruce Davison as Dr. Brooks
- Andrew Divoff as Mikhail Bakunin
- Mira Furlan as Danielle Rousseau
- Billy Ray Gallion as Randy Nations
- Jon Gries as Roger Linus
- Greg Grunberg as Seth Norris (voice)
- Veronica Hamel as Margo Shephard
- Brad William Henke as Bram
- Lillian Hurst as Carmen Reyes
- Suzanne Krull as Lynn Karnoff
- William Mapother as Ethan Goodspeed
- Rob McElhenney as Aldo
- Harold Perrineau as Michael Dawson
- Michelle Rodriguez as Ana Lucia Cortez
- Fisher Stevens as George Minkowski
- Kevin Tighe as Anthony Cooper