Every episode of ABC's genre-bending television series Lost, about a group of plane-crash survivors stranded on a tropical island, is collected here.A passenger jet breaks apart in mid-air, crash-landing on a tropical island somewhere in the Pacific Ocean. Left without the creature comforts and basic necessities of civilization, the 48 survivors are forced to rely upon one another to stay alive -- and given the personality quirks of these survivors, this won't be easy during the first season of the ABC hit series Lost. Generally with the help of flashbacks, viewers learn a number of deep dark secrets about the castaways on a need-to-know basis, especially the demons plaguing Dr. Jack Shephard (Matthew Fox) and one-hit-wonder rock star Charlie Pace (Dominic Monaghan). Every so often, a crisis arises for the principal purpose of revealing a hitherto unknown and unsuspected aspect of one of the characters. Inevitably, hostilities both minor and serious arise from the basic fundamental differences among the survivors: Korean couple Jin and Sun Kwon (Daniel Dae Kim, Yunjin Kim) are unable to uphold their family traditions under the circumstances, while their inability to speak English creates an additional barrier between themselves and the others; and the MacGyver-like resourcefulness of former Iraqi Republican Guard Sayid (Naveen Andrews) is not enough to overcome the racism of some of his fellow passengers. Then there is the unfriendly aura of the island itself, with its inscrutable topography, and the bizarre menagerie of wild animals, ranging from a polar bear to a (possible) dinosaur! Also, the discovery in one episode of two long-dead bodies certainly does nothing to uplift the rescue hopes of the hapless survivors. And finally, there seems to be someone else on the island...someone not on the passenger list...someone who kidnaps two of the castaways and threatens to kill off the rest one by one. The one overriding question near the end of season one is: who among the "major" characters will not make it to season two?Season 3 chronicles 24 more days on the island (Nov. 28-Dec. 21, 2004) and focuses on the survivors' struggles with the Others and their leader Benjamin Linus (Michael Emerson). Ben, formerly known as captive Henry Gale, was freed by Michael last season, and then Michael delivered Jack (Matthew Fox), Kate (Evangeline Lilly) and Sawyer (Josh Holloway) to Ben in exchange for his son Walt and a get-off-the-island-free ticket. Ben locks Kate and Sawyer in outdoor cages, but that doesn't prevent them from locking lips and taking their relationship to a new level. Jack is imprisoned in the Hydra station, where Ben asks him to remove a tumor from his spine. Jack reluctantly removes the tumor, but uses the surgery to help free Kate and Sawyer. Facilitating their release are Ben's teen daughter Alex (Tania Raymonde) and duplicitous Other Juliet (Elizabeth Mitchell), a fertility doctor recruited by the group's seemingly ageless second-in-command Richard Alpert (Nestor Carbonell) because pregnant women on the island were dying. Back at the beach camp, Desmond (Henry Ian Cusick), who with Locke (Terry O'Quinn) survived the Hatch implosion in the Season 2 finale, has visions of the future, including some that concern and frighten Charlie (Dominic Monaghan); Claire (Emilie de Raven) contracts a mysterious illness; Mr. Eko (Adewale Akinnuoye-Agbaje) runs afoul of the Smoke Monster; and Sawyer and Locke clear up their issues with Locke's father (Kevin Tighe). A woman named Naomi Dorrit (Marsha Thomason) parachutes onto the island and tells the survivors that she has come from an offshore freighter sent by British industrialist Charles Widmore (Alan Dale), the father of Desmond's long-lost love Penny (Sonya Walger). Also, Locke appears to forge an alliance with Ben and the Others and meets their supreme leader Jacob, and it becomes clear that Locke is, as Ben puts it, "in communion" with the island. ~ Paul DroeschSome of the island's mysteries and dangers are revealed during the second season, which spans 23 days (Nov. 4-27, 2004) and opens with Jack (Matthew Fox), Kate (Evangeline Lilly) and Locke (Terry O'Quinn) venturing into the hatch for the first time. There they discover Desmond (Henry Ian Cusick), whose job is to key a numeric sequence into a computer every 108 minutes. They eventually learn that the reason for this task (later undertaken by Locke) is to prevent the release of damaging electromagnetic activity (which can cause plane crashes, for instance). They also learn that the hatch and other structures on the island were built in the 1970s by a scientific research group called the Dharma Initiative. The survivors make their first sustained contact with passengers from Flight 815's tail section, led by a paranoid former L.A. cop named Ana Lucia (Michelle Rodriguez) and including psychologist Libby (Cynthia Watros) and a Nigerian drug dealer named Mr. Eko (Adewale Akinnuoye-Agbaje). It's not a happy reunion: The Tailies capture Michael (Harold Perrineau), Jin (Daniel Dae Kim) and Sawyer (Josh Holloway) because Ana Lucia thinks they belong to a mysterious and hostile group of islanders who come to be known as the Others.The misunderstanding is cleared up, but not before someone has a fatal encounter with Ana Lucia. In other developments, Claire (Emilie de Ravin) recalls what happened to her when she was abducted by the Others; Sun (Yunjin Kim) learns she is pregnant, even though Jin was sterile off the island; and Libby and Hurley (Jorge Garcia) forge a sweet relationship. Michael is reunited with his kidnapped son Walt (Malcolm David Kelley), but at great cost after the survivors find a wounded man (Michael Emerson) who calls himself Henry Gale. He says he's a marooned balloonist from Minnesota, but the survivors suspect Other-wise. ~ Paul DroeschThe survivors choose sides (Jack or Locke?) in Season 4, which spans nine days (Dec. 21-30, 2004) and opens with the castaways awaiting rescue by the offshore freighter crew. But when four strangers arrive on the island via helicopter, Jack (Matthew Fox) and others begin to question the intentions of their supposed rescuers: physicist Daniel Faraday (Jeremy Davies), cultural anthropologist Charlotte Lewis (Rebecca Mader), medium Miles Straume (Ken Leung) and pilot Frank Lapidus (Jeff Fahey). All four have a personal motive for coming to the island-and it soon becomes clear that rescuing the castaways is not their top priority. The primary objective of the freighter crew, sent by Charles Widmore (Alan Dale), is to capture Benjamin Linus (Michael Emerson) and bring him back alive. Some castaways, including Hurley (Jorge Garcia), Claire (Emilie de Ravin), and Sawyer (Josh Holloway), are troubled by Charlie's final warning about the freighter folk and decide to follow Locke (Terry O'Quinn), who has no interest in leaving the island, to the Dharma barracks. Sayid (Naveen Andrews) and Desmond (Henry Ian Cusick) eventually find their way to the freighter, where Desmond deals with strange side effects related to his travels. Upon their arrival, they are surprised to see a familiar face among the crew members. Long-gone Flight 815 survivor Michael (Harold Perrineau) has infiltrated Widmore's freighter and is acting as a mole for Ben. Off the island, frequent flash-forwards (first employed during the series-changing Season 3 finale) reveal six castaways do finally make their way home. The identities of the Oceanic Six, as they're dubbed by the media, are gradually unveiled throughout the season, as are the lies they told regarding the fates of their fellow passengers. They may have made it home safely, but it's certainly not a happily ever after for the Oceanic Six. It soon becomes evident that the island is not yet finished with them, and neither is Ben. ~ Karen Andzejewicz"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.