Locke is enlightened as to the whereabouts of Jacob's cabin, and life aboard the freighter becomes perilous.

Kate's need to get information out of the hostage may jeopardize her standing with Locke -- as well as with Sawyer.

Kate's need to get information out of the hostage may jeopardize her standing with Locke -- as well as with Sawyer.

The survivors begin to question the intentions of their supposed rescuers when four strangers arrive on the island.

The survivors begin to question the intentions of their supposed rescuers when four strangers arrive on the island.

Bobby Carter (Dan Byrd) tells his sister Brenda (Emilie De Ravin) and Doug Wood (Aaron Stanford) that there are people living in the hills.

Bobby Carter (Dan Byrd) tries to protect his sister Brenda (Emilie De Ravin) by shooting one of the hill people.

High-schooler Brendan Frye s (Joseph Gordon-Levitt) piercing intelligence spares no one. Brendan is not afraid to back up his words with actions, and knows all the angles; yet he prefers to stay an outsider, and does until the day that his ex-girlfriend, Emily (Emilie de Ravin of Lost), reaches out to him unexpectedly and then vanishes. Brendan's feelings for her still run deep; so much so, that he becomes consumed with finding his troubled inamorata.

High-schooler Brendan Frye s (Joseph Gordon-Levitt) piercing intelligence spares no one. Brendan is not afraid to back up his words with actions, and knows all the angles; yet he prefers to stay an outsider, and does until the day that his ex-girlfriend, Emily (Emilie de Ravin of Lost), reaches out to him unexpectedly and then vanishes. Brendan's feelings for her still run deep; so much so, that he becomes consumed with finding his troubled inamorata.

This brief video explains the show concept.