1ª Temporada

Episódios

	Introdução - Parte 1---- Original Air Date: September 22, 2011 Em uma floresta, há um soldado perdido de seu pelotão fugindo de uma criatura, a qual foi designado a buscar, quando encontra Diego, outro soldado. Os dois correm até uma casa abandonada ficando lá para tentar se esconder. Lá, são atacados por uma luz que leva Diego. Tentando fugir Ketlin sai da casa, mas o céu esta coberto por um disco voador e percebem que fugir é impossível.
	Requiem - Parte 2---- Original Air Date: October 13, 2004 Flashback: Ketlin Garcia Depois da abdução de Diego e Ketlin, Diego acorda em um hospital. Ele descobre que a U.C.I.A, grupo a qual pertence se desvinculou do exercito e agora ele e seu colegas terão de investigar as invasões sem a ajuda direta das forças armadas. Em seu primeiro caso, mortes misteriosas no local do sumiço da E.T fazem com que ele e seus colegas voltem ao local de seu rapto.
[1]
	As Trombetas do Apocalipse---- Original Air Date: October 20, 2004 Depois da abdução de Diego e Ketlin, Diego acorda em um hospital. Ele descobre que a U.C.I.A, grupo a qual pertence se desvinculou do exercito e agora ele e seu colegas terão de investigar as invasões sem a ajuda direta das forças armadas. Em seu primeiro caso, mortes misteriosas no local do sumiço da E.T fazem com que ele e seus colegas voltem ao local de seu rapto.
[2]
	House of the Rising Sun---- 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.
[3]
	The Moth---- 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.
[4]
	Confidence Man---- 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.
[5]
	Solitary---- 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.
[6]
	Raised By Another---- 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.
[7]
	All the Best Cowboys Have Daddy Issues---- 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.
[8]
	Whatever the Case May Be---- 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.
[9]
	Hearts and Minds---- 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.
[10]
	Special---- 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.
[11]
	Homecoming---- 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 given to the survivors by Ethan Rom and a trap is set in motion.
[12]
	Outlaws---- 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.
[13]
	...In Translation---- Original Air Date: February 23, 2005 Flashback: Jin-Soo Kwon The raft is set ablaze and accusations fall on Jin.
[14]
	Numbers---- 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.
[15]
	Deus Ex Machina---- 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.
[16]
	Do No Harm---- 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.
[17]
	Lost - The Journey---- 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.
[18]
	The Greater Good---- 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.
[19]
	Born to Run---- 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.
[20]
	Exodus - Part 1---- Original Air Date: May 18, 2005 Flashback: Walt Lloyd, Jack Shephard, James "Sawyer" Ford, Kate Austen, Shannon Rutherford and Sun Kwon 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.
[21]
	Exodus - Part 2---- Original Air Date: May 25, 2005 Flashback: Jin-Soo Kwon, Charlie Pace, Michael Dawson, Hugo "Hurley" Reyes and John Locke 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. The opening of the hatch is finally accomplished.