Locke and Jack went together to the heart of the island in Lost Season 6 Episode 17, and they proceeded to lower Desmond toward the light.
Juliet, David, and Claire are at the benefit concert, where a passed out Charlie is awakened by Charlotte. Daniel also happens to be back stage, as he’s a piano player who coincidentally is accompanying Driveshaft at the show (really?). Yeah, Kate, Miles, Desmond, and Dr. Chang are there, too. It’s Claire who catches Charlie’s eye, and then the baby kicks.
Desmond reaches the light, and all hell breaks loose. You expected something else? Locke thinks Jack was wrong when the light starts to go out. Seeing as Jack is able to make Locke bleed now, perhaps he was wrong, too. The bad news for Jack is that Locke can make him bleed as well, knocking him upside the head with a rock.
For something that wasn’t such a big deal, Claire is not so much being kicked by her baby as she is going into labor. This all seems familiar to her and Kate, who have delivered this baby together before (or sideways or whatever the appropriate time reference is). Charlie, likewise, is led to flashbacks of them being together. Since they all remember, now what?
The rain’s going and trees start falling on people. Like Ben. Frank, Miles, and Richard, meanwhile, tell them they’d better get over there because they’re fixing the plane and leaving in an hour.
Jack’s back up and looking to go for round 2 with Locke, which will take place on a cliff that’s crumbling around them. This time, Jack gets stabbed, but the attempt to stab him in the neck fails when Kate shoots Locke. Good timing. Then Jack kicks him off the cliff. If he’s not dead, he probably should be.
Locke wakes up in the hospital telling Jack it worked. He can feel his legs. Unlikely or not he can regain sensation that quickly, he can even move them. Then he sees the island, and Jack starts to see something, too. He tells Jack he doesn’t have a son, although that’s who he’s going to go see.
Whatever Desmond turned off, Jack wants to turn it back on. He sends Kate off to get Claire on the plane. Though he can’t promise they’ll see each other again, they can still kiss and profess their love. Sawyer is off, too. Hurley and Ben join Jack, though.
In order to get to the boat so they can reach Frank and the plane he’s fixing, Sawyer suggests jumping of the cliff. Sounds good enough for Kate.
Sawyer, at the hospital to see Sun, runs into Jack. Then he meets Juliet, too. Why not? Now these two are having their own set of flash sidewayses as well, and they can get their own lip locking.
Jack goes to the concert when it’s over, and he bumps into Kate. Where does he remember her from? Perhaps if she touches this man who doesn’t know her, he’ll remember. Or think she’s crazy.
Jack plans to go into the darkness to protect the island, or commit suicide, whichever it may be. He leaves the protection of the island going forward in Hurley’s hands. Desmond put out the light thinking he would leave this place. So much for that theory. Jack wants him to go home now. He’ll see him in another life.
Kate talks Claire into going with them, but Frank doesn’t hear Sawyer’s request to wait. Just in time, they run in front of the plane to be let in. Way to wait until the last second. With the ground getting set to implode around them, it’s time for take off. In the nick of time, they’re up in the air.
Meanwhile, in the belly of the island, Jack has put the stone back in place to allow the light to start glowing again. Seeing that, Hurley and Ben start pulling. Wrong guy. They’ve landed themselves a Desmond.
Ben apologizes for what he did to Locke. He was selfish and jealous that he was special. If it helps, Locke forgives him. That does help, and by the way, you can get out of that wheelchair now.
With Jack gone, Hugo’s now stuck doing that job. Ben suggests maybe there’s a better way than how Jacob ran things, such as letting people leave the island.
Kate brings Jack to where he was going to have his father’s funeral. They’ll be waiting inside for him once he’s ready to leave.
When he gets inside and touches his father’s coffin, he finally remembers everything. Then he opens it. It’s empty, but then he turns around and sees his dead father standing behind him. Seems they have something in common. They’re both dead. Everybody in the church? They’re dead, too. But they made a place together so that they could find each other because they all need each other to remember and to let go. Now it’s time to move on.
Jack wakes up on the island. He’s in rough shape, but he’s a few steps above dead. After collapsing, he hears Vincent coming up from behind him. Then he sees a plane fly overhead. His eyes close. And that is apparently how we’re going to end the series. Really?