There are two separate and distinct stories this week. In one, Desmond and Sayid try to learn a bit more about the boat by demanding a meeting with the captain. They meet him, but not before witnessing a member of the crew throw herself to her doom in the ocean's depths. The captain is surprisingly forthcoming, telling Desmond and Sayid that Charles Widmore sent the boat, and that someone faked the wreckage of Oceanic 815, including coming up with 324 dead bodies. The captain implies that "someone" is Ben. Finally, Sayid and Desmond are given a room of their own. And they meet Ben's man on the boat. It's Michael. Which I suspect you already guessed, based on the fact that his name has been in the credits for six weeks.
In the other story, Sun decides that she doesn't trust the Boaties or Juliet, and that she wants to head to the Barracks to hide out with Locke. Jin agrees to go with her, but Juliet really wants her to get off the island so she and her baby won't die. To keep Sun from leaving, Juliet tells Jin about Sun's affair. Jin is understandably upset, and decides he'd rather stay at the beach. He storms off, but after Bernard speaks to him, he decides to forgive Sun. Meanwhile, Sun speaks with Juliet, who convinces her that she really will die if she doesn't leave the island. So they end up back together, with Jin promising that he'll never leave Sun.
Finally, the flash-forwards are all about Sun and Jin. She's in Korea, where she is massively pregnant and goes into labor. We see her at the hospital going through the normal delivery drama and crying out for Jin. Meanwhile, we see Jin rushing through the city, trying to make it to the hospital. Along the way he buys a stuffed panda, gets his cell phone run over, loses the panda, and buys another. He finally arrives at the hospital...and we learn that he's there to deliver the panda as a gift to the new grandson of the Chinese ambassador. At first you think he's neglecting Sun to focus on his crappy job. And then he tells a nurse that he's only been married two months, leading us to think he had indeed left Sun. But then Hurley shows up in Korea, and he and Sun go to visit Jin's grave. So the Jin part of the flash-forward was actually a flashback. And in the future, Jin is either dead, or perhaps still on the island. It's all very confusing.
Previously, Sayid and Desmond arrived at the freighter, where a mysterious benefactor opened a locked door for them. And Sun got knocked up by Jin. Which, according to Juliet, means she's doomed. Doooooooomed!
It's nighttime on the boat. Frank is walking along the deck when Keamy asks him if he's "ready." Frank tells him that he'll be up. I guess Keamy has a little of that Nolte fever. As Frank walks away, Keamy tells him, "Don't be late, Frank." Bossy bottom. Frank walks into the boat's interior.
Frank walks along a corridor with a paper bag under his arm. He comes upon a woman sitting in a chair reading a book. It's Regina, and she looks a little out of it. He tells her that her book is upside down. Way to make her feel bad about her illiteracy, Frank. Her book is The Survivors of the Chancellor, by the way. (As always, tremendous thanks to the Eagle-Eyed Forum Posters, without whom this job would be impossible.) That book is absolutely terrifying, and should pretty much be banned from every boat in the world. Frank tells Regina he's there to deliver some food, and she tells him to go on in.
Frank enters the sick bay, where Sayid and Desmond (and Desmond's décolletage) are hanging out. Frank tells them he's there to deliver some food -- canned lima beans. Yummo. Sayid wants to know why they're still being held prisoner, and Frank tells him the captain's not too happy with them for busting out of the sick bay. Sayid tells him that they didn't bust out -- someone opened the door. They assumed it was Frank, but he doesn't seem eager to claim credit. Sayid tells him they want to speak with the captain. Frank doesn't think that's a very good idea. He knocks on the door, and Regina lets him out.
On the beach, Sun is sitting near fire when Jin walks over and sits with her. She's worried because it's been three days since Sayid and Desmond left, but he'd rather talk about baby names. Sun tells him it's bad luck to discuss baby names so early, and he accuses her of being superstitious. She tells him she's just scared to jinx the baby. Which is exactly what a superstitious person would say. The tease each other about whether it's a boy or a girl. Jin wants a girl, and wants to name her Ji Yeon. Sun thinks it's a beautiful name, but doesn't want to discuss it. They agree to pick a name after they get off the island.