In a nutshell
Weird island exists, with unexplained woman on it. A shipwreck brings people to it, centuries ago. One of them, a pregnant woman, is murdered by the unexplained woman, & the twin baby boys are raised by her, one becoming the island's immortal protector, & the other becoming a trapped mystical force, inhabiting it. It takes the form of either a column of smoke, or deceased island inhabitants.
Later in 1867, a slave trading ship wrecks on the island. The sole survivor is chosen to be the island protector's immortal ambassador. Some 90 years later, he is instrumental in removing the U.S. military from the island, leaving behind a buried atomic bomb. Within the next couple decades, a scientific institute, named The Dharma Initiative, develops a research community on the island. They maintain an antagonistic relationship with the prior inhabitants.
Separate stations are developed, on the island for each of Dharma's experiments. One boy, Ben Linus, defects from Dharma, to grow up to be the leader of the group of other inhabitants. He organizes the eradication of the Dharma personnel, takes over their stations, & begins developing a bigger, & better community of people devoted to the island's protector
1988 an expedition team wrecks on the island. All of its members end up dead or murdered. The sole surviving pregnant woman has her baby stolen, by Ben Linus, & spends 16 years in search of it. in 2001 a Scottish sailboat racer wrecks on the island, & is convinced to be the partner of one of the station operators. 3 years later, whilst killing his partner, he fails to execute the program that disperses an immense electromagnetism, & accidentally causes the crash of a commercial passenger airliner.
From this plane crash, 22 survive from the tail section, & 48 survive from the mid-section, plus one dog. A couple island inhabitants infiltrate the two survivor camps, Some survivors end up being abducted by the existing inhabitants, while others begin discovering the Dharma stations, most importantly, the one manned by the Scot.
Conflict begins escalating, between the crash survivors, & the other inhabitants. One of the crash survivors betrays the rest, to regain possession of his son, & secure escape. The electromagnetism station is neglected, which results in its implosion. Shortly thereafter, a freighter, sent by a former island inhabitant, is charged with finding the island, & succeeds.
While some plane crash survivors attempt to secure rescue aboard it, others implement a force which relocates the island. The freighter is destroyed, & only six of the plane crash survivors escape the island, along with the Scottish sailor & the helicopter pilot, to be rescued by the Scot's lover
The remaining plane crash survivors find themselves catapulted throughout time, to various points in the island's history, until one of them manages to halt the effect & strand the rest in the 1970's. A group of people who have left the island, including the 6 crash survivors, return to the island, aboard another passenger airliner, some of whom are mystically transported to the 1970's time period. They, along with their fellow comrades detonate the atomic bomb, in order to alter the time line. Meanwhile, in the present time period, Ben Linus, having left & returned to the island, murders the island's protector
After the atomic bomb detonation, those people trapped in the 1970's time period return to the present time period. From this point on, they, along with various other remaining individuals, endeavor to prevent the mystical smoke being from both escaping the island, & destroying it. It is revealed that many of the island inhabitants, including many of the original plane crash survivors were brought to the island, by its protector, as candidates for his replacement.
The smoke being attempts to destroy all the candidates, in numerous indirect ways, but is eventually killed, while in the form of a deceased plane crash survivor. Very few people survive all these events, a handful of whom escape the island again. However, when death comes to the most important of all these characters, they all end up either trapped in a ghost like form, on the island, or they emerge in an afterlife holding zone where they participate in a mutually devised fantasy reality, until they are ready to move on, into the next stage of after life
