Lost: Season 3, Episode 5

3 - 5: The Cost of Living

A delirious Eko wrestles with demons from his past, while Locke and some of the other castaways head back to The Pearl -- one of the Dharma Initiative's island stations -- hoping to find a computer that they can use to locate Jack, Kate and Sawyer. Meanwhile, Jack doesn't know whom to trust when two of 'The Others' seem at odds with one another.