Episode number: 5

Original air date: February 28, 2008

Flashback: Desmond Hume

Written by: Carlton Cuse and Damon Lindelof

Directed by: Jack Bender

Plot: Sayid and Desmond hit a bit of turbulence on the way to the freighter, which causes Desmond to experience some unexpected side effects.

Guest starring: Jeff Fahey as Frank Lapidus, Alan Dale as Charles Widmore, Sonya Walger as Penelope, Graham McTavish as sergeant, Darren Keefe as Billy, Edward Conery as auctioneer, Marc Vann as doctor, Fisher Stevens as George Minkowski, Kevin Durand as Keamy and Anthony Azizi as Omar

Episode number: 6

Original air date: March 6, 2008

Flashback: Juliet Burke

Written by: Drew Goddard and Christina M. Kim

Directed by: Eric Laneuville

Plot: Juliet receives an unwelcome visit from someone from her past and is given orders to track down Charlotte and Faraday in order to stop them from completing their mission -- by any means necessary. Meanwhile, Ben offers Locke an enticing deal.

Guest starring: Alan Dale as Charles Widmore, Andrea Roth as Harper Stanhope, M.C. Gainey as Tom and Brett Cullen as Goodwin

Episode number: 11

Original air date: May 8, 2008

Flashback: John Locke

Written by: Elizabeth Sarnoff & Kyle Pennington

Directed by: Paul Edwards

Plot: Locke, Hurley, and Ben trek through the jungle in search of Jacob's cabin and answers, while tensions run high aboard the freighter as Keamy prepares to return to the Island.

Guest starring: Anthony Azizi as Omar, Grant Bowler as Captain Gault, Nestor Carbonell as Richard Alpert, Kevin Durand as Martin Keamy, Jeff Fahey as Frank Lapidus, Doug Hutchison as Horace Goodspeed, Lance Reddick as Matthew Abaddon, John Terry as Christian Shephard, Marc Vann as Doctor Ray, Phil Abrams as Gellert, Amanda Carlin as ER nurse, Sarah Duval as Melissa, Matthew Pedersen as Physical therapist, Holland Roden as Teenage Emily, Caleb Steinmeyer as John Locke (age 16), Rebecca Tilney as Emily's mother, Patrick Torres as ER doctor, Mandy June Turpin as Florence, and Charles Henry Wyson as John Locke (age 5).

Episode number: 10

Original air date: February 28, 2007

Flashback: Hugo "Hurley" Reyes

Written by: Edward Kitsis and Adam Horowitz

Directed by: Eric Laneuville

Plot: Hurley’s discovery of an old, wrecked car on the island leads him on a mission of hope not only for himself, but for a fellow survivor in need of some faith. Meanwhile, Kate and Sawyer reunite with their fellow castaways, but Kate is still torn about leaving Jack behind with "The Others".

Guest starring: Mira Furlan as Danielle Rousseau, Lillian Hurst as Carmen Reyes, Billy Ray Gallion as Randy, Cheech Marin as David Reyes, Caden Waidyatilleka as young Hurley, Suzanne Krull as Lynn Karnoff and Sung Hi Lee as Tricia Tanaka

Episode number: 11

Original air date: March 7, 2007

Flashback: Sayid Jarrah

Written by: Carlton Cuse and Damon Lindelof

Directed by: Stephen Williams

Plot: Locke, Sayid and Kate investigate a strange structure and its mysterious inhabitant. Meanwhile, Sawyer competes in a ping-pong competition to get back his belongings.

Guest starring: Mira Furlan as Danielle Rousseau, April Grace as Ms. Klugh, Andrew Divoff as Mikhail Bakunin, François Chau as Pierre Chang, Shaun Toub as Sami, Anne Bedian as Amira, Taiarii Marshall as waiter and Eyad Elbitar as Arabic man

Episode number: 20

Original air date: May 9, 2007

Flashback: Benjamin Linus

Written by: Elizabeth Sarnoff and Drew Goddard

Directed by: Bobby Roth

Plot: Ben begrudgingly begins to introduce Locke to the secrets of the island, beginning with the mysterious Jacob. Meanwhile, Juliet's secret goes public.

Guest starring: M.C. Gainey as Mr. Friendly/Tom, Tania Raymonde as Alex, Andrew Divoff as Mikhail, Nestor Carbonell as Richard Alpert, Marsha Thomason as Naomi, Sterling Beaumon as Young Ben, Jon Gries as Roger Linus, Carrie Preston as Emily, Doug Hutchison as Horace, François Chau as Pierre Chang, Samantha Mathis as Olivia, Madeline Carroll as Annie, Jenn Boneza as DHARMA Welcomer, Gregory Suenaga as DHARMA Rep. 1 and Diamante Kielo as Opal.

Episode number: 07

Original air date: November 16, 2005

Flashback: None; the narrative breaks chronology to tell the story of the tail-section survivors from the day of the crash.

Written by: Damon Lindelof and Carlton Cuse

Directed by: Eric Laneuville

Plot: The harrowing first 48 days in the lives of the tail section survivors are revealed.

Guest starring: Sam Anderson as Bernard, Kimberley Joseph as Cindy, Brett Cullen as Goodwin, Josh Randall as Nathan, Glenn Lehmann as Donald, Kiersten Havelock as Emma and Mickey Graue as Zack.