Locke puts his plan into action, which could liberate him from the island. 

The ABC "Lost" Series Finale event is set to kick off with the airing of "Pilot, Parts 1 & 2," an enhanced version of the two-hour pilot of the series that changed the way viewers watch television. The enhanced pilot will feature exclusive insight with the cast saying goodbye to the groundbreaking series and talking about what "Lost" has meant to them over the years.

In the actual episode ("The End part 1"):

Locke searches for Desmond to achieve his goal of destroying the island. Jack, the newly-appointed "protector" of the island, sets out to stop him. In Los Angeles, the survivors slowly reunite and recall their island experiences. 

ABC invites new and avid "Lost" viewers to take a final glance at one of television's most talked about and critically acclaimed shows. The "Lost" Series Finale Event begins with this two-hour special, which takes a retrospective look back over the past six seasons of this groundbreaking series.

While Locke devises a new strategy, Jack's group searches for Desmond.

The motives of John Locke are finally explained.

Jack must decide whether or not to trust Locke after he is asked to follow through on a difficult task.

Alliances are forged and broken as the Locke and Jack camps merge.

Hurley agonizes over what the group should do next, and Locke is curious about the new arrival to his camp.

Desmond wakes up to discover he's back on the island.

Sun and Jin desperately continue their search for one another, and Locke confronts his enemy.

Richard Alpert faces a difficult choice.

Locke tasks Sawyer with a mission.

Ben deals with the consequences of an uncovered lie.

Sayid is faced with a difficult decision, and Claire sends a warning to the temple inhabitants.

Hurley must convince Jack to accompany him on an unspecified mission, and Jin stumbles across an old friend.

Locke goes in search of help to further his cause.

Kate finds herself on the run, while Jack is tasked with something that could endanger a friend's life.

ABC once again invites new and avid "Lost" viewers to take another look at one of the most talked about and critically acclaimed shows. "Lost: Beginning of the End" will explore the series in a way that will bring new viewers up to date -- but which current viewers will also find illuminating - in anticipation of the two-hour final season premiere. The special will take a look at the crash of Oceanic Flight 815, the mysteries of the island, its inhabitants, the Oceanic 6, the violent shifts through time on the island and the detonation of the hydrogen bomb. It will also delve into some of the questions that have been answered, and those that still remain a mystery.

Oceanic Air flight 815 tore apart in mid-air and crashed on a Pacific island, leaving 48 passengers alive and stranded on a remote island in the South Pacific. The survivors include a diverse group of people from different walks of life -- a doctor, an escaped fugitive, a con man, an Iraqi interrogator, a married Korean couple and a man formerly confined to a wheelchair who is now inexplicably healed. As the castaways attempt to get home, flashbacks (and forwards) illuminate their troubled lives before and after the crash, when the island they find themselves stranded on begins to slowly reveal its mysterious nature. Faith, reason, destiny and free will all clash as the island offers opportunities for both corruption and redemption.. but as to its true purpose? That's the greatest mystery of all.