Season 1

• Original Air Date: September 22, 2004
• Flashback: Jack Shephard

The Passengers of Oceanic Flight 815 suddenly arrive on a mysterious island after a horrific plane crash.

• Original Air Date: September 29, 2004
• Flashback: Charlie Pace and Kate Austen

The survivors hike into the jungle to obtain a signal on the transceiver. Meanwhile, Jack tends to an injured Marshal.

• Original Air Date: October 6, 2004
• Flashback: Kate Austen

Kate's experiences in Australia before the crash are revealed. And the Marshal takes a turn for the worse.

• Original Air Date: October 13, 2004
• Flashback: John Locke

Locke, Kate and Michael go into the jungle to hunt boars after the food supply runs low. And, Jack formulates a plan as to how to handle the bodies in the fuselage.

• Original Air Date: October 20, 2004
• Flashback: Jack Shephard

Jack's sleep deprivation takes a toll on him as he begins to see visions of his father. Meanwhile, as the water supply begins to diminish, blame is placed as to who took the remaining water.

• Original Air Date: October 27, 2004
• Flashback: Sun-Hwa Kwon

Jin attacks Michael on the beach, and as a result in handcuffed to a piece of wreckage. Meanwhile, Sun reveals a secret she has been hiding.

• Original Air Date: November 3, 2004
• Flashback: Charlie Pace

Charlie attempts to deal with a conflict plaguing him. Jack becomes trapped in a cave-in and Charlie makes an effort to rescue him. And Kate, Sawyer, and Sayid try and triangulate the source of the French Transmission.

• Original Air Date: November 10, 2004
• Flashback: James "Sawyer" Ford

After Shannon suffers from an asthma attack Boone accuses Sawyer of possessing her inhalers. Sayid and Jack attempt to retrieve them by any means necessary.

• Original Air Date: November 17, 2004
• Flashback: Sayid Jarrah

Sayid uncovers a wire on the beach and follows it to discover more than he imagined. Hurley builds a golf course to provide some much needed entertainment.

• Original Air Date: December 1, 2004
• Flashback: Claire Littleton

Claire begins to have nightmares, and believes that she is a target in the camp. Her past before the crash is revealed.

• Original Air Date: December 8, 2004
• Flashback: Jack Shephard

After Claire and Charlie go missing, search parties are formed to capture the man responsible, Ethan. Jack's relationship is further revealed.

• Original Air Date: January 5, 2005
• Flashback: Kate Austen

Kate and Sawyer discover a suitcase while swimming, and the objects inside become the objects of obsession for the two. Sayid and Shannon attempt to make sense of Rousseau's documents.

• Original Air Date: January 12, 2005
• Flashback: Boone Carlyle

Locke and Boone attempt to gain entry into the hatch, and Boone hallucinates in the jungle.

• Original Air Date: January 19, 2005
• Flashback: Michael Dawson and Walt Lloyd

Walt goes missing and Michael and Locke venture into the jungle to find him.

• Original Air Date: February 9, 2005
• Flashback: Charlie Pace

Claire returns to the camp with a case of selective amnesia. A past love of Charlie's is revealed. A threat is give to the survivors by Ethan Rom and a trap is set in motion.

• Original Air Date: February 16, 2005
• Flashback: James "Sawyer" Ford

Sawyer attempts to track a boar who destroyed his camp. Kate joins him in hopes of getting closer to him. Sawyer's past before the crash reveals he is a devious con.

• Original Air Date: February 23, 2005
• Flashback: Jin-Soo Kwon

The raft is set ablaze and accusations fall on Jin.

• Original Air Date: March 2, 2005
• Flashback: Hugo "Hurley" Reyes

Hurley's past is discovered, and his connection to the island is deeper than most thought.

• Original Air Date: March 30, 2005
• Flashback: John Locke

Locke begins to lose feeling in his legs and has a dream of a Beechcraft airplane crashing on the island. Boone and Locke set off to uncover it. Meanwhile, Sawyer suffers from headaches which begin to affect him.

• Original Air Date: April 6, 2005
• Flashback: Jack Shephard

An injured Boone is brought back to the camp, and Jack does his best to repair the damage. Sayid and Shannon trek off for a secluded romantic encounter. Claire goes into labour.

• Original Air Date: April 27, 2005
• Narrator: Brian Cox

The first of the Lost specials focuses on the characters, recapitulating and discussing the flashbacks seen so far.

• Original Air Date: May 4, 2005
• Flashback: Sayid Jarrah

Sayid and Locke venture into the jungle to the fallen Beechcraft. Claire reluctantly gives Charlie possession of the newborn Aaron.

• Original Air Date: May 11, 2005
• Flashback: Kate Austen

Kate tries to gain Sawyer's spot on the raft. Michael falls ill during the construction of the raft.

• Original Air Date: May 18, 2005
• Flashback: Various

After a warning is given by the mysterious Rousseau, five of the survivors accompany her to the elusive "Black Rock". Meanwhile, the raft sets sail with four of the survivors.

• Original Air Date: May 25, 2005
• Flashback: Various

The survivors make their way to the caves for shelter against the arrival of the "Others". The six retrieve dynamite from the Black Rock. The four on the raft find others while at sea. An opening of the hatch is finally accomplished.