Claire awakens to find baby Aaron missing again. Desmond provides cryptic clues about fate and how to find baby Aaron. Realizing he knows far more than he's letting on, Sayid knocks out Desmond, places him in cuffs and the search party (Sayid, Charlie, Claire, and Hurley) begin hunting for Aaron.
Meanwhile, Locke sees the Kate's SOS sign; on the smaller island. He boldly tries to swim towards it and when he weakens physically, Michael and Walt return to rescue him. As Locke regains strength, the group heads toward the smaller island in the boat. When they reach Kate, the loud sound of the Black Smoke Monster is heard, destroys Michael's boat and ascends on the group. Elsewhere on the island, Jack demands escape after saving Ben and is led to the submarine, then promptly knocked out.
Desmond leads the search party to a hut, where Rosseau appears and holds Desmond at gunpoint demanding everyone follow her to a new "hatch" that contains a time machine that works off a formula with specific numbers. Eventually, all groups (Aaron search party, Locke and crew with monster, and Ben and Jack) arrive. Locke fights the monster and Ben starts the countdown and procedure for the time machine. As he counts down from 15, the monster and Walt have a confrontation while the machine starts messing up - but there's no way to stop the countdown. At the end of the countdown, heavy vibrations are felt and a white light is seen. When it's over, the room is empty.
The final shot is the island, peaceful and without people... until a massive jet crashes in the sky, Oceanic 815.
01. Patchy is the Man
02. The Endless Cycle Ends
03. The Life of the Island
04. The Dark Tower Effect
05. Wouldn't you like to be an Other too?
06. That Darn Dog!
07. Profiteering Patchy
08. The Metafictional Waltz
09. Rock Around the Locke Tonight!
10. Got Some Raid?
11. The Snow Globe Effect
12. Fate, Formulas, and a time machine
13. Congratulations, you're an alien!
14. Jack and Locke as Sacrifices to Faith