High Quality Content by WIKIPEDIA articles! "Dave" is the 43rd episode of Lost and the 18th episode of the second season. The episode was directed by Jack Bender, and written by Edward Kitsis and Adam Horowitz. It first aired on April 5, 2006 on ABC. In flashbacks, Hugo "Hurley" Reyes is in a mental institution, where he deals with an imaginary friend, Dave. Libby is also featured in a flashback, revealing that she attended the institution along with Hurley. The island events in the present day have Hurley seeing Dave on the island, while other survivors confront "Henry Gale" after his backstory is revealed to be false.