Locke's mission off the island as Jeremy is revealed.
Hurley and Sayid find themselves on the run after trouble at the safe house; unknown forces attack survivors left on the island; an old friend has shocking advice for Kate.
Kate learns that someone knows the secret of Aaron's parentage; the dramatic shifts through time endanger the remaining island survivors.
Locke shoulders the burden of ending the island's increasingly violent movements through time; Ben is stymied in his efforts to reunite the Oceanic 6 and bring them back to the island.
Kate takes drastic measures to save Ben's life when Jack refuses to help.