When Prentiss and Reid go undercover to investigate possible child abuse at an underground cult, they get trapped inside the compound when a federal raid goes bad. Luke Perry ("Beverly Hills, 90210") guest stars as cult leader Benjamin Cyrus.
Locke finds out where Jacob's cabin is; life on the freighter becomes dangerous.
Desmond experiences unexpected side effects when he and Sayid hit turbulence on the way to the freighter.
Sayid and Kate try to negotiate for Locke's hostage, whom they think might be the key to getting off the island.
The survivors begin to question the intentions of their supposed rescuers when four strangers arrive on the island.
