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This finale brings the season-long "hatch" mystery to a catastrophic head while permanently altering the group dynamic through Michael's betrayal. Flashbacks: The Arrival of Desmond Hume

: Desmond accidentally killed Kelvin in a rage and, in his despair, almost failed to push the button on the day Oceanic 815 crashed. Lost_2x23_Si_Vive_Insieme_Si_Muore_Soli_Parte_0...

: Desmond’s predecessor in the Swan Station who trick Desmond into staying by claiming the world outside was infected. This finale brings the season-long "hatch" mystery to

The Season 2 finale of , titled "Live Together, Die Alone" (or "Si vive insieme, si muore soli" in Italian), is widely regarded as one of the most pivotal episodes in the series. Spanning two hours and originally airing as a single event, it is often split into Part 1 and Part 2 (Episodes 23 and 24) for syndication. The Season 2 finale of , titled "Live

In the present, the survivors are split into two high-stakes missions:

: Kelvin revealed a "fail-safe" key that could be used as a last resort to discharge the electromagnetic buildup if the button were never pushed. Island Events: Faith vs. Logic