Episode Name: Dave
Episode Overview: Libby lends a helping hand to Hurley to support him when he begins to think the island is having a strange effect on him. Hurley begins to see Dave on the island, who was his friend in the mental institution Hurley was in. Also, Locke's sense of purpose is shaken when the prisoner gives him new information about the hatch.
Episode Number: 18
Episode Season: 2
Episode First Aired: 2006-04-05