The Oceanic Six returns to the island, and now you can follow them on their mysterious adventure by taking home the fifth season of LOST in this five disc set packed with exciting and informative bonus materials. Take a trip behind the scenes with "LOST on Location," watch cast-member Michael Emerson dig for clues in "Building 23 and Beyond," journey across the island with Nestor Carbonell in "An Epic Day with Richard Alpert," get a humorous glimpse at the ongoing effort to keep all the show's timelines flowing smoothly in "Making Up for LOST Time," study a recently unearthed expose questioning the truth of the Dharma Initiative in "Mysteries of the Universe: The Dharma Initiative," laugh at bloopers, watch deleted scenes, and listen to audio commentaries. Exclusive Blu-Ray features include the interactive "LOST University," in which fans can delve deeper into the show's secrets than ever before, and "LOST 100," an in-depth reflection on the first 100 episodes."When am I?" John Locke's chronological confusion sums up Season 5, which hopscotches dizzyingly between the 1970s and 2008 as it charts the Oceanic Six's return to the island and reveals important island secrets. On the island, Locke (Terry O'Quinn) is the new leader of the Others. But in L.A., he's dead, and his death plays a key role in getting Jack (Matthew Fox), Kate (Evangeline Lilly), Hurley (Jorge Garcia) and Sun (Yunjin Kim) to return via Ajira Airways. Sayid (Naveen Andrews) refuses to join his fellow former castaways, but winds up being escorted onto the Guam-bound flight by a bounty hunter named Ilana (Zuleikha Robinson). Ben (Michael Emerson) must return, too, to face judgment for allowing his daughter Alex to die. Their flight -- with Frank Lapidus (Jeff Fahey) at the controls -- is a bumpy one, but the final destination is indeed the island. Ben, Sun, Ilana and Frank remain fixed in time upon their return to the island, but Jack, Kate, Hurley and Sayid are flashed back in time to 1977, where they are reunited with Sawyer (Josh Holloway) and Juliet (Elizabeth Mitchell). After surviving a series of time-travel flashes, Sawyer and Juliet landed in the 1970s and forged a close relationship with each other and the Dharma Initiative, which also welcomes Miles Straume (Ken Leung). Meanwhile, Miles' colleague Daniel Faraday (Jeremy Davies) embarks on a time-traveling mission that introduces him to a nuclear bomb named Jughead and a young woman named Ellie. Both play prominent roles as the season progresses.