The Cost of Living

S3 E5: 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 to be at odds with one another.