Lost airs on ABC on Wednesdays at 9 p.m. EST. This season has 23 episodes.
Episode 2.19: S.O.S. (Rose/Bernard-centric)
Airdate: April 12, 2006 from 9 p.m. to 10:04 p.m.
04/05 - We'll see Vincent in next week's episode. Source: Ask Ausiello @ TV Guide
03/27 - Guest starring are L. Scott Caldwell as Rose, Sam Anderson as Bernard, Michael Emerson as Henry Gale, Wayne Pygram as Isaac and Donna Smallwood as Aussie woman. Source: ABC
03/23 - Rose is surprisingly and vehemently opposed to Bernard's plan to create an S.O.S. signal; romantic sparks are rekindled between Jack and Kate when they trek into the jungle to propose a "trade" with "The Others"; and Locke begins to question his faith in the island. Source: ABC
03/22 - My Lost mole confirms that a May-sweeps episode will delve into the couple's backstory. And not only will we find out how the lovebirds met, but we'll discover that Rose has something rather surprising in common with Locke. Source: Ask Ausiello @ TV Guide
03/21 - This May, the island elders Rose and Bernard will get their own flashback episode. Sources say we'll learn how the lovebirds met and that Rose and Locke share something very surprising in common. Source: TV Guide (March 27-April 7 issue)
03/21 - Writer/Supervising producer Javier Grillo-Marxuach reveals: We are going to explore more in detail and we're gonna find that [Rose and Bernard] have very interesting back-stories. Source: The Official Lost Magazine, Issue 4, May/June 2006
03/17 - The episode will feature a 40-year-old Australian female named Lindsey. Source: SpoilerFix.com
02/26 - [This episode features] Isaac, a well regarded physical therapist who lives in Australia. Source: SecretAgentMan at TWoP
Episode 2.22: Three Minutes (Michael-centric)
Airdate: May 17, 2006
04/12 - Michael will be getting a flashback episode on May 17, during which we'll learn what, um, Others stuff he's been up to these last couple of months. Whatever it is he's been doing, I understand we'll meet a very different Michael than the one we left. Walt will also be back, and yes, he'll still be played by Malcolm David Kelley. I'm also hearing that [the] episode contains a great scene between Jack and Sawyer. Even better than the poker stuff. Source: Ask Ausiello @ TV Guide
03/30 - Guest star is 'Mrs Klugh', a smart, interesting, edgy, powerful businesswoman in her early 40's. Source: SecretAgentMan at TWoP
Episode 2.23: Title Unknown (2-hour season finale)
Airdate: May 24, 2006 from 9 to 11 p.m.
04/11 - Guest stars for season finale: Cameron, British (Rupert Murdochish) 50, rich steel tycoon, ruthless, competitive, protective of his daughter; Penelope, late 20's, beautiful, strong, daughter of Cameron, wants a simple life, to fall in love and start a family. Though she has no interest in her family's money she eventually uses it to get what she wants. Source: SecretAgentMan at TWoP
04/05 - We'll see Vincent in the finale. Source: Ask Ausiello @ TV Guide
Episode 2.20: Two for the Road (Ana-Lucia-centric)
Airdate: May 3, 2006
04/09 - Jack and Kate bring an exhausted Michael back to the camp, and with him, news about "The Others." Meanwhile, Ana Lucia attempts to get the prisoner to confess, and Hurley plans a surprise date for Libby. Source: ABC
Episode 2.21: ?
Airdate: May 10, 2006
04/01 - Turns out that supercool black-light reveal is a major plot point that carries on through the rest of the season. "Oh yeah, big time," Damon said. "I mean, it plays huge in the finale, and even in episodes 21 through 24. Twenty-one is an episode that is very much on the sort of fundamental axis of that map, and it's a Locke and Eko story, which is going to be awesome. [Executive Producer] Carlton [Cuse] and I wrote it. That episode is just called '?' because that is the symbol Locke remembers from the map." Source: Kristin on E!Online