Watch "Season 5 Episode 13 : ‘Some Like it Hoth’ Trailer"

Ben and Locke return to the island, where Ben says he is going to summon the Smoke “monster” and atone for his daughter’s death. In addition, the falling-out on the island between Ben and Charles Widmore is revealed.

Watch "Season 5 Episode 12 : ‘Dead Is Dead’"

Jack refuses to help save young Ben after Sayid shoots him, so Sawyer and Kate turn to Richard Alpert for help. Meanwhile, what Sawyer said to Kate on the chopper is revealed, as well as what Kate did with Aaron before the flight.

Watch "Season 5 Episode 11 : ‘ Whatever Happened, Happened’"

Sayid is held as a prisoner by the Dharma Initiative, presumed to be a Hostile. However, during his capture, he believes he has discovered the reason why he’s back on the island.

Watch "Season 5 Episode 10 : ‘He’s Our You’"

Jack, Kate and Hurley wind up on the island in 1977, where they meet up with Sawyer and also join the Dharma Initiative. Meanwhile, Sun is stuck on the island in the present with Ben and the other passengers after the plane crash.

Watch "Season 5 Episode 9 : ‘Namaste’"

The survivors left on the island, now led by Sawyer after Locke’s departure, find themselves back in the 1970s, where they are now forced to become members of the Dharma Initiative.

Watch "Season 5 Episode 8 : ‘LaFleur’"

John Locke, now alive again and back on the island after the second plane crash, flashes back to his return to civilization, where he is brought in by Charles Widmore and asked to convince the Oceanic 6 to return to the island.

Watch "Season 5 Episode 7 : ‘The Life and Death of Jeremy Bentham’"

Eloise explains that the Oceanic 6 have a very limited window to return to the island, and leaves Jack instructions to bring one of his father’s items to John Locke.

Watch "Season 5 Episode 6 : ‘316′"

In order to avoid being killed, Ben promises to offer proof to Sun that Jin is still alive. On the island, Jin meets up with the survivors as Locke reaches The Orchid and fulfills his mission.

Watch "Season 5 Episode 5 : ‘This Place Is Death’"

In Los Angeles, Kate tries to find out who is trying to take Aaron away from her. Back on the island, Locke convinces everyone that they have to go to The Orchid.

Watch "Season 5 Episode 4 : ‘The Little Prince’"

Watch "Season 5 Episode 4 : ‘The Little Prince’ Sneak Peeks"

Desmond goes in search of a woman who could be the key to helping Faraday stop the island’s erratic movements through time.

Watch "Season 5 Episode 3 : ‘Jughead’"