Lockdown (Lost)

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"Lockdown" is the 17th episode of the second season of the American drama television series Lost, and the 42nd episode overall. The episode was directed by Stephen Williams, and written by executive producers Carlton Cuse and Damon Lindelof. It first aired on ABC in the United States on March 29, 2006.

The character of John Locke (Terry O'Quinn) is featured in the episode's flashbacks, revealing how he broke up with his romantic partner Helen (Katey Sagal). In the present, the Dharma Initiative station that Locke is in suddenly and inexplicably places itself under lockdown, leaving him and his captive Henry Gale (Michael Emerson) to find a way out and input the numbers before the station's countdown ends. Meanwhile, Jack (Matthew Fox) plays a card game with Sawyer (Josh Holloway) before a large package of food is discovered to have mysteriously dropped on the island.

"Lockdown" was seen by an estimated 16.21 million American household viewers. The episode received positive reviews from critics, with praise given for the plot development and Emerson's performance.