: Locke gets pinned under a blast door during a sudden station "lockdown." He is forced to trust "Henry Gale" (Ben Linus) to enter the computer code and save him.
: Often cited by fans as one of the strongest episodes of Season 2 due to its high tension and the introduction of the blast door map.
: While pinned, Locke sees a complex map of the Island's DHARMA stations drawn in ultraviolet ink on the blast doors. This becomes a major puzzle for fans to decode.
: Locke is approached by his father, Anthony Cooper, who asks for help with a scam. Locke also encounters Nadia (Sayid’s lost love) during a home inspection.
: This episode marks one of the several "cross-over" moments where characters meet in flashbacks without knowing it—specifically Locke and Nadia.
: The map contains references to various DHARMA stations, including The Swan (where they are), The Flame , The Staff , and The Pearl .
: The lockdown was triggered for an automated pallet of DHARMA supplies to be dropped by parachute onto the island.
This guide covers , the 17th episode of Season 2 of Lost (42nd overall), which originally aired on March 29, 2006. This John Locke-centric episode is famous for revealing the "blast door map" and deepening the mystery of the Others.