The following information is gathered from various articles, interviews and The Fuselage forums. The following can be considered RUMOR and subject to change or otherwise inaccurate. Spoilers for episodes that have already aired are left just to see the track record of the spoilers. Spoilers for more distant episodes can be considered far more unreliable.
Episode 13: The Long Con; A "Sawyer" episode; Episode Summary Now Available
Written by Steven Maeda & Leonard Dick; Directed by Roxann Dawson; 2/8/06
Sun is injured during a failed kidnapping attempt. A leadership struggle appears between Ana-Lucia, Jack, Kate and Locke. Diane, Kate's mother, apparently appears in Sawyer's flashbacks. This flashback is probably the source of a plot twist between Kate and Sawyer. Damon Lindelof posted this to The Fuselage: "And if you think Locke is dark, wait'll you see Charlie in a couple of weeks. Hell hath no fury than an addict scorned..."
Although long rumored that this would be a Locke episode, it's not looking that way now.
Episode 14: One of Them; A "Sayid" episode; Episode Summary Now Available
Written by Damon Lindelof and Carlton Cuse; Directed by Stephen Williams; 2/15/06
Sayid's flashback takes him back to Iraq and he has dealings with a CIA agent. His brother and a friend in the Iraqi military also appear in his flashbacks. Danielle and Sgt. Austen (Kate's father/step-father) appear. A new recurring character, Henry Gale, is introduced. Clancy Brown guest stars as Joe Inman. Seems as though another bunker/hatch is discovered in this episode [Webmaster's note: It turned out to be found in 2.15].
Episode 15: Maternity Leave; A "Claire" episode; Episode Summary Now Available
Written by Dawn Labertsen Kelly & Matt Ragghianti; Directed by Jack Bender; 3/1/06
Another crash survivor is found on the island: a 16 year old named Jessica, whose age coincides with Danielle's child Alex. Claire starts remembering things from her kidnapping. Danielle tries to help Claire. Aaron gets sick and Locke and Jack attempt to hide their prisoner, Henry Gale, from the other survivors. Ethan and Mr. Friendly/Bearded Man also return in this episode.
Episode 16: The Whole Truth; A "Jin & Sun" episode; Episode Summary Now Available
Written by Elizabeth Sarnoff & Christina M. Kim; Directed by Karen Gaviola; 3/22/06
Flashbacks will include a "romantic" love triangle. Jae Lee returns in the flashback, along with a character who is a Dr. (of what is unknown). Rose and Bernard appear in this episode. Henry Gale again appears.
Episode 17: Lockdown; A "Locke" episode; Episode Summary Now Available
Written by Damon Lindelof & Carlton Cuse; Directed by Stephen Williams; 3/29/06
Flashbacks are to include a "kindly" Latino priest. Cooper and Helen (Katey Segal) also apparently return. Flashback possibly includes a scene where Locke walks into a bank after driving a company truck of some kind. The flashbacks will show Locke is "connected" to Sawyer (probably using a similar gimmick that "linked" Sawyer to Kate by her mother being his waitress & Sayid is "linked" to Kate because her father/step-father served in the Persian Gulf).Sayid, Ana-Lucia and Charlie go looking for Henry Gale's balloon, and apparently actually find that the downed balloon exists. Sayid's Nadia also turns up. Henry Gale again appears. Locke is rumored to need crutches for the rest of the season. Since the Hatch is to "take on a life of its own," perhaps this would result in Locke's injury.
Episode 18: Dave; A"Hurley" episode; Episode Summary Now Available
Written by Edward Kitsis & Adam Horowitz; Directed by Jack Bender; 4/5/06
Flashbacks will include Phil (apparently has been changed to Dave), a personable man in his 20's-30's. Leonard will also appear in the flashbacks. Hurley's time in the mental institution will feature in the flashbacks. Libby and Hurley have some sort of past connection. One would assume that it would be revealed in either his or her flashback episode.
Episode 19: S.O.S.; A "Rose & Bernard" Episode; Episode Summary Now Available
Written by Steven Maeda & Leonard Dick; Directed by Eric Laneuville; 4/12/06
Possibly the Rose and Bernard flashback episode. Flashbacks include Isaac, a respected physical therapist, who lives in Australia. A middle-aged Australian woman will also appear. Rose and Locke have some sort of connection. Rose and Jin might have something in common (possibly being cheated on by their spouses?).
Episode 20: Two For the Road; An "Ana Lucia" Episode; Episode Summary Now Available
Written by Elizabeth Sarnoff & Christina M. Kim; Directed by Paul Edwards; 5/3/06
Jack and Kate bring Michael back to the beach camp and he has news about the "Others." Ana Lucia's mother appears in her flashbacks. Henry Gale again appears.
Episode 21: ?; An "Eko" Episode; Episode Summary Now Available
Written by Damon Lindelof & Carlton Cuse; Directed by Deran Sarafian; 5/10/06
Claire will apparently appear in the flashback, although it doesn't look to be a Claire episode. The blacklight (seen in Episode 217) will be part of a story arc in the final four episodes. Eko's brother Yemi appears not in flashbacks, but in visions on the Island (like Jack's father). Also appearing is Richard Malkin, the psychic who warned Claire about Aaron. Malkin is somehow tied to Eko. Libby and Eko are seen together at the airport. The blacklight map also apparently brings Eko and Locke together again in their diverging views of faith and we will learn what the "?" is in the center of the map.
Episode 22: Three Minutes; A "Michael" Episode; Episode Summary Now Available
Written by Edward Kitsis & Adam Horowitz; Directed by Stephen Williams; 5/17/06
Flashbacks are to feature a smart businesswoman in her 40's. Flashback may also show what happened to Michael while he was away and explain his behavior since his return. Walt, "Mr. Friendly" and Alex (the girl seen in Claire's Island flashback) appear. Eko decides to stop building the church, which Charlie struggled to deal with.
Episode 23: Live Together, Die Alone; A "Desmond" Episode; Episode Summary Now Available
Written by Carlton Cuse & Damon Lindelof; Directed by Jack Bender; 5/24/06
Two-hour season finale
Libby will be seen in Desmond's flashback in LA where she offered her boat to him. The stadium where Desmond and Jack first met will again be seen. Kelvin, Widmore and Dr. Candle all appear. Building an "army" will supposedly return as will some elements of Charlie and Claire's relationship. The flashbacks will apparently show Desmond's life in the Hatch. The cause of the plane crash will be revealed. 5/10/06: Henry Gale, Walt, Bernard (but not Rose), Alex and "Mr. Friendly" all appear. Also supposedly appearing is Clancy Brown who portrayed CIA operative Joe Inman earlier this season. He is credited in the ABC press release as Kelvin (?) Inman in this episode. 5/17/06: The reason the plane crashed is said to be revealed and Walt's story will be resolved [they've been saying that all season, so I'm not holding my breath]. We will also learn what happens when the button is not pushed in the Hatch. 5/19/06: Henry Gale is said to be set to be a recurring character for Season 3, so that would seem to indicate that he survives the season finale.
Note: These spoilers are more general than those listed above for specific episodes and many are likely to fall by the wayside. These are items mentioned by the showrunners as intended storylines, but it's likely that more than a few of these will prove to be well off-target by season's end. Newer spoilers are added at the top of the list: 5/19/06 - Henry Gale is set to be a recurring character for Season 3. 5/17/06 - Though Libby has been killed off, her backstory is set to be told in flashbacks in Season 3. 5/13/06 - More Details and Screenshots of Season 2 DVD to be released October 3rd (Click here) 5/6/06 - Season 2 DVD to be released October 3rd (Click here for Announced DVD Details) 5/3/06 - Kate will find out about Sawyer's intimacy with Ana Lucia and will not be happy about it.
Rumors have again begun about another death coming before the season ends.
Another underground [perhaps underwater] structure will soon be revealed. [This was presumably the medical bunker.]
The sign from the London skyline in Charlie's flashback (in Episode 2.12) was for Widmore Construction, which will return later.
The Other named Alex that brought out Claire (in Epiosde 2.11) is "most likely" Danielle's child.
Damon Lindelof has hinted that the Arrow bunker might not have been one of the other stations, but just a storage bunker. He also suggests that there may be other Arrow bunkers on the Island.
The lines in the Dharma logo have some significance when looking at their "simplest elements."
Damon Lindelof suggests that Ethan and Goodwin may not have known each other and that there may different factions of Others.
Eko's encounter with the monster was different from Locke's. It sets him off on his "destiny," which is different since he has closers ties to the Island thanks to the drug plane.
The "rules" put forward by the Bearded Other (Mr. Friendly) will affect the survivors the rest of the season.
The survivors will find out what happens when the button is not pushed.
It will be learned what is behind the magnetic wall.
It will be explained why Hurley hasn't lost weight.
More Jack flashbacks.
According to the showrunners, Walt's fate will be determined by the end of Season 2.
Dharma is an acronym.
The Eko/Locke relationship will be a focal point for the rest of the season.
We may find out that Ana Lucia and Sayid have something more in common than lover/murderer of Shannon. [War in Iraq, perhaps?]
As hinted at in the Orientation film, there are six bunkers on the Island so there are several possibilities for strange occurances.
More will eventually be learned about Dharma, including the possibility of that long-rumored Pre-crash island/project flashback.
Danielle and Desmond will reappear this season.
More will be learned about why Ethan abducted Claire.
The Dark Territory will be ventured into and more strange occurrences/out of place objects will be seen there.
Jolene Blalock (Star Trek: Enterprise) and perhaps Robert Patrick (Hibbs) were slated to appear in Episode 202 ("Adrift") in Sawyer's flashbacks until the episode was changed to Michael. They still may appear later in the season in a Sawyer episode.
The second season will cover roughly the same amount of time on the island (45-50 days) as the first season, which means the second season will end around the 3 month mark for the survivors.
What the survivors find in the hatch will have an effect on the rest of the season.
Rose will be frequently seen in Season 2.
Romances may heat up as the survivors cope with the fact that they may be stuck on the island for a while. Charlie and Claire grow closer, though his affinity for drugs (the heroin-filled statues) will be an issue. Shannon will decide where Sayid belongs in her life. Jack and Ana-Lucia will spark as well.
Walt will not be seen for several episodes early in the second season (apparently after Shannon sees him the the first episode).
The reason that the airplane crashed will be revealed in second season, and it apparently wasn't due to someone who was a passenger.
The island will be explored much more.
One current female regular (killed off) and one current male regular (not killed off) will leave during the second season, while at least five new regular characters will appear.
Ana-Lucia (Michelle Rodriguez), seen in a flashback talking with Jack at the airport bar, becomes a main character in season 2. She supposedly sat in the tail section, which did have some survivors, who have had a very different experience since the crash. She also supposedly knows more about the cause of the crash.
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