Claire's "friend" Locke/smoke monster stops by

Back at Claire's shack, Jin lies to her and says that Kate doesn't actually have Aaron. He tells her that he saw Aaron at the temple and that he'll help her get him back. Claire is relieved, because she says if Kate really did have Aaron, that she'd have to kill her.

Locke suddenly pops his head in the shack and Jin is stunned and says "John?" Claire tells him that it's not Locke, it's her friend. Locke/Smokey gives a fiendish smile and that's the end.

So how does Claire know that Locke is not really Locke? Will we get to see what happened to her during her three years on the island? What exactly has Locke been telling her besides the lie that the others have Aaron?

Jacob tells Hurley that Jack need to wreck the lighthouse & someone bad is going to the temple

At the lighthouse, Jack is sitting on some rocks on the cliff staring at the ocean. Hurley is still by the lighthouse when Jacob appears. Hurley thanks Jacob for the seven years of bad luck, then says that whoever needed to find the island won't be able to now. Jacob says that they will find another way to the island.

Hurley realizes that things worked out how Jacob had planned. Jacob says that Jack has something to do and he needs to figure it out on his own. He says that sometimes you can just tell someone what they need to do, like Hurley, but other times, with someone stubborn like Jack, you have to let them find it on their own.

Jacob then reveals that he needed both Hurley and Jack away from the temple, because someone bad is going there. Hurley wants to go help them, but Jacob tells him it's too late.

So who exactly is coming to the island and how will they find it? And what is the important thing that Jack needs to do? Is he the chosen candidate?

Names on lighthouse dial + mirrors show Jack's childhood home + Jack trashes it

Hurley and Jack make it to the top of the lighthouse to find a giant dial operated by gears and a pulley to change the degrees. There are four mirrors attached to reflect the light of a fire bowl in the center. Next to each degree, there is a name. The numbers seem to match the numbers Sawyer saw on the cave's walls.

Hurley starts to change it to 108 degrees as Jacob told him to, but Jack watches the mirrors and sees glimpses of the place where Sun and Jin were married and the church where Sawyer's parents funeral was held. Both places were where Jacob met them. Jack then notices his own name and takes over, turning it to 23, Shephard. In the mirrors, he sees his childhood home (the one we saw in the flash sideways earlier in the episode). Jack deduces that Jacob had been watching them and then he snaps at Hurley, demanding to know why Jacob was watching him. Jack grabs a telescope from a stand in the corner and proceeds to smash all of the mirrors.

Here's a list of the names I could decipher on the wheel (be sure to click "Read more" below to view the full list along with tons of screens.

14 - Pryce (Ryan?)
15 - Ford (James "Sawyer")
16 - Jarrah (Sayid)
17 - Barnes
18 - Kueffner
19 - Nguyen

Jack meets Dogen & Dogen's son at David's audition for the Williams Conservatory

Jack goes to the Williams Conservatory t o find David. Once he's inside, he hears David performing "Fantaisie-Impromptu in C-Sharp Minor," the same piece of music Jack found in David's room (it's also the same piece young Daniel Faraday performed in the season 5 episode "The Variable"). Jack is clearly moved by David's performance.

A young Asian boy, who we can assume is Dogen's son, tells Jack that David is really good then walks away. As Jack is leaving the room, Dogen stops him and says that their sons are too young to have this kind of pressure. When he asks Jack how long David has been playing, Jack has to admit that he doesn't know, which is reminiscent of Michael's answers about Walt during the custody meeting in the season 2 episode "Adrift."

That's a fun little cross the new timeline, but what does that mean for the island's fate if Dogen never went there?

Claire kills Justin with the axe, Jin tells her Kate has Aaron

Back with crazy Claire, she is holding the axe and threatening Justin and asking where Aaron is. Justin repeatedly tells her that he doesn't know and that they don't have her. She's obviously been convinced by Christian and Locke that they have Aaron.

So she starts to swing the axe at Justin when Jin tells her to stop. Claire says that the other stuck her with needles and branded her, just like they did to Sayid. She shows Jin the scar from the brand. As Claire prepares to swing again, Jin tells her that Kate took Aaron off of the island. Justin tells her that Jin is telling the truth and pleads for her to let him go. Claire pauses for a moment and then swiftly buries the axe in Justin's chest. Jin is stunned.

So why did Claire kill Justin even though Jin told her the others didn't have Aaron? Did she think Jin was lying or was she going to kill Justin no matter what happened?

Jack & Hurley discover the lighthouse, kicks in the door

Just before Hurley and Jack reach the lighthouse, Hurley reveals to Jack that he returned to the island because Jacob approached him in the cab in Los Angeles. Jack reveals that he believes he was broken and that returning to the island could fix him.

They then reach the oceanfront where the massive, ancient lighthouse is revealed. Jack asks the question most viewers, including myself were likely thinking. How had they never seen the lighthouse before? Hurley quickly responds, maybe because they were not looking for it.

A flash of light can briefly been seen at the top of the lighthouse. Once they reach the door, it is locked, but Jack kicks it in and they enter. More on the inside of the lighthouse later.

Jack searches for David, goes to his ex-wife's home

Jack comes home from his mother's house to find David missing. He let's time pass from day to night and then calls David again and apologizes if he didn't anything to upset David and says he's going to David's mother's home.

Once he arrives, he knocks and then pulls a key from underneath a small statue of a rabbit (it's not a white rabbit, but rabbits keep showing up in the show). Also, the house number is "233" and 23 is one of the numbers. Once he enters, the shots are very precise to keep any family photos in the dark and out of focus so we can't potentially see who David's mother could be.

Jack goes up to David's room which is full of musical instruments (including a keyboard, guitar and trumpet), music posters, sheet music, CDs and other stuff. Jack stops and looks at the sheet music for Chopin's "Fantasie Impromptu" which is sitting on the desk. There is also pictures of Jack and David together from a photo booth, again we see David is a Dodgers fan because he's wearing a baseball cap.

Jack listens to the answering machine messages in David's room. The first reveals his location. He is at an audition at the Williams Conservatory. The second message is one from Jack while he was in Australia. He only reveals that "something happened" and he wanted to hear David's voice.

So who do you think David's mother is? It seems that this is a mystery that's going to pay off sometime soon, because it has to.

Jack & Hurley find Shannon's inhaler, visit the caves, Adam & Eve skeletons & Christian's coffin

As Jack and Hurley make their way through the jungle, Jack steps on something that was pivotal to the season one plot. It's none other than Shannon's missing inhaler.  Jack looks up and realizes that they are at the caves which were last seen in the season two episode "Adrift."

They go in the caves and Hurley examines the "Adam and Eve" skeletons, which had only been seen once before in the season one episode "House of the Rising Sun" when Jack discovers them. Hurley comes up with a theory that the survivors time travel to "dinosaur times" as he calls it, died and were then laid to rest in the caves.

Meanwhile, Jack is staring at Christian Shephard's coffin which he destroyed in the season one episode "White Rabbit" after he discovers Christian's body is not inside. He tells Hurley the truth about how he found the caves, since everyone originally thought he stumbled upon them while looking for water.

Hopefully this scene is going to lead to an answer to both of these big questions in coming episodes. Exactly who are the skeletons, how did they get there and when? And then, what exactly happened to Christian's body and is it somehow tied to the body's disappearance in the new timeline?

Claire patches up Jin, wide view of her shack

Back at Claire's shack, she is sterilizing some medical tools in water over a fire. It's possible she took them from medical station or got them elsewhere. She also sharpens her axe while she's outside.

Justin tries again to convince Jin to let him go, but Jin doesn't As Claire starts to sew up Jin's trap wound,  she says that she once had to patch up her own wound when the others shot her in the leg. She says she had to move around a lot to avoid the others.

She then says that Christian and then her "friend" (the smoke monster/Locke) told her that the others have her baby. So it seems that Smokey is manipulating her to get what he wants, because he/it certainly knows that Aaron is not on the island.

Once she finishing sewing up Jin's wound, she picks up the axe and turns to Justin and says "Now it's your turn." We'll pick up the rest of this scene later.

Jack helps his mom search for Christian's will, Claire is named in it

Jack arrives at his mother's home (and his childhood home) to help her search for Christian's will. When Margo fixes herself a drink, we can see that familiar red label marking McCutcheon's whiskey sitting with other bottles.

Margo tells Jack that David was upset at Christian's funeral and Jack says that he didn't know. Margo points out that David is likely as scared of Jack as Jack was scared of Christian.

She then finds the will in an envelope on a book shelf. She opens and begins to read and then asks Jack if Christian ever mentioned Claire Littleton.

So what did Christian leave Claire in his will and will this lead to Jack and Claire crossing paths in the new timeline?

Claire keeping a "squirrel baby" in cradle, explosives + Justin's alive

Jin wakes up to find himself in Claire's makeshift shack, his leg still very bloody and painful from the trap. He looks around and sees some random Dharma food, clothing and a crate of explosives from the Black Rock. He then notices a makeshift cradle and looks inside to find a hideous thing made of random animal furs, a skull and other bits. It's been dubbed "squirrel baby."

Claire comes back dragging Justin with her, who was only pretending to be dead earlier. After tying up Justin and she turns her attention to Jin saying "We'd better get that cleaned up. If there's one thing that'll kill you around here it's infection." A clever little line hinting at the infection Rousseau talked about, but referring to a literal infection.

Jin asks her if she's been by herself all this time, and she coyly says "I'm not by myself." When she steps outside, Justin tells Jin that Claire is going to kill them both.

So Claire has clearly gone off the deep end which is especially punctuated by the squirrel baby.

Hurley's follows Jacob's directions, tells Dogen he can do what he wants

Hurley makes his way through a temple hallway, following Jacob's directions which he wrote on his left forearm. We can see that Hurley is looking for a specific hieroglyphics symbol on the wall which he finds.

He is then approached by Dogen who tells him to go back to the courtyard. Jacob appears to Hurley telling him to tell Dogen that he is a candidate and he can do what he wants. Dogen is stunned, but folds, muttering some Japanese that translates to "You're lucky that I have to protect you. Otherwise I'd have cut your head off." After Dogen leave, Jacob tells he needs to bring Jack and when Hurley asks how he's supposed to convince Jack, Jacob smiles slyly.

Claire helps Jin out of trap, doesn't know it's been 3 years

Out in the jungle, Claire checks to Justin's body and he appears to be dead. She goes to help Jin out of the trap. Jin asks if she's been out in the jungle all of this time and she says that she has since the other survivors left. Jin says that it has been three years and she seems unaware of how long it's been, much like Rousseau and her 16 years. Claire offers to take Jin somewhere safe, but he is unable to walk.

So, did Claire travel back and forth in time with the other survivors after Ben turned the frozen donkey wheel, or did she stay in the present? It would seem that if she was back in the 1970s, she would have been less likely to have been alone for all of those years.

David Shephard reading 'The Annotated Alice,' likes the Dodgers

Back at Jack's apartment, we see David's room, which has a framed picture of Dodger Stadium on the wall. Jack tells him that he hooked up the cable in there so he could watch the Red Sox, so this seems to indicate that he doesn't really pay attention to what David likes.

Jack picks up a copy of The Annotated Alice: The Definitive Edition by Lewis Caroll that David has. Jack says that he used to read the book to David when he was little. Jack also read the story to Aaron when he and Kate were together after the Oceanic 6 left the island.

David won't stop and talk to Jack, and we he Jack stops him, David says they only see each other once a month and can't they just get through it. Jack gets a call from his mother and leaves.

We can see here that Jack has carried his daddy issues with Christian into his own relationship with David, which we'll see more of later.

Jacob appears at the temple + Hurley & Miles play tic-tac-toe

At the temple, Hurley and Miles are playing a game of tic-tac-toe on the ground with sticks, leaves and vines. When Hurley goes to the spring to try to find some food, he sees Jacob on the spring's steps, staring at the water.

Jacob tells Hurley that someone is coming to the island and that Hurley needs to help them find it. He says that he'll need to write a few things down.

Jack puzzled by appendix scar, has son named David

We start out the episode "Lighthouse" with one of Lost's signature bad Photoshop jobs. This one features the Shephard family, Christian, Jack and Margo. Next to it is a photo of Jack and Christian at the hospital looking very happy together, which is the opposite of what we've usually seen when they are together.

Jack rushes into his apartment to change out of his scrubs, and while he's in the bathroom, he notices a scar from having his appendix removed. Jack's mother Margo calls and asks if there's an update on Christian's coffin. Jack says that Oceanic told him that the coffin may have been checked through Berlin, Germany. He then asks her when he had his appendix taken out. She says that it was when he was 7 or 8, but in the original timeline, Jack had his appendix taken out on the island by Juliet.

Jack rushes off to St. Mary's Academy where a young boy his sitting on the steps waiting. We learn that this is David, Jack's son. So this indicates a massive change in Jack's timeline. This shows that his timeline has been altered not only 15 years ago with the birth of David, but when he was a child if he had is appendix out. So what are the causes of these big differences?