Frank Lapidus Frank's role in the first half of season four was diminished, and some planned storylines were carried over into the fifth season. Frank's introduction, along with the three other new characters from the freighter introduced in season four, was well received, as was his return in season five. "Lost" executive producer Damon Lindelof confirmed in an interview that Lapidus would be a series regular for the show's sixth and final season. Originally from The Bronx, New York, Frank was the intended pilot of Oceanic Airlines Flight 815, which crashed on an island in the South Pacific. He is first encountered
USS PC-815 appears to have been mostly inactive during this period. According to her Movement Card she took part in the occasional offshore patrol, training exercises and escorting submarines in and out of the harbor. She was restored to active duty on 2 September 1945, but at 6:47 a.m. on 11 September, the ship collided with the destroyer in dense fog off San Diego. The collision started a fire on board "PC-815", which sank within five minutes. One man from "PC-815" was recorded as missing, presumed drowned. The "Laffey" suffered significant damage, with the fire from "PC-815" spreading into one of the