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Title: Dave
Original Air Date: 05/04/2006
Writer: Edward Kitsis, Adam Horowitz
Director: Jack Bender
Guest star: Michael Emerson (Henry Gale) , Ron Bottitta (Leonard), Grisel Toldeo (Nurse), Evan Handler (Dave), Bruce Davison (Dr. Brooks)

Synopsis: 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 (guest-star Evan Handler) 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.

[TV.com]