Movies and TV Shows

Everyone died on the plane crash, the plane actually sunk to the bottom of the ocean. Everyone who "survived" went to the Island, which was a type of purgatory. The survivors had to discover an afterlife for them all to live in. They actually find the sunk plane in the real world, and when new people arrive on the island, they remember hearing about the lost flight and the dead passengers whose bodies were found inside the plane. At one point, a couple survivors escape the island and go back to the real world, but eventually they come to find they no longer belong in the land of the living and head back. The big focal point near the end is where a nuclear-weapons-like device goes off and there's a new storyline where the plane doesn't crash. This new storyline is where the survivors finally found a happy afterlife to live in together. They end up reliving all the major events of the first season, and as they do, they remember their lives on the island and their relationships with each other.

I can't truly spoil it, they treated the whole series like a fever dream. We spent the whole think collecting hints and details while they barely stayed consistent within their own canon.

There was this one scene fairly early on I think in the second season They had to leave this control center room and as the blast shields were coming down to permanently seal the room there was a giant black light drawing of the island and all kinds of glorious details of relays and switches and control centers. We froze the frame and extracted it and poured over it for weeks. They really didn't use any of it going forward.

I'm fairly certain they just made the story up as it went along trying to throw curve balls to anyone that would guess what was going to happen.

By the time it was done there was time travel, immortal beings and the afterlife all kind of just crammed together to make sure that no one could have seen exactly what was coming.