ABC airs the 25th episode of the J.J. Abrams-produced series Lost. The second season premiere introduces Henry Ian Cusick as Desmond. Anson Mount (Inhumans, Star Trek: Strange New Worlds) guest stars. 
ABC airs the 25th episode of the J.J. Abrams-produced series Lost. The second season premiere introduces Henry Ian Cusick as Desmond. Anson Mount (Inhumans, Star Trek: Strange New Worlds) guest stars.
ABC airs the 26th episode of the J.J. Abrams-produced series Lost. Henry Ian Cusick, Adewale Akinnuoye-Agbaje, and Saul Rubinek guest star.
ABC airs the 27th episode of the J.J. Abrams-produced series Lost. Henry Ian Cusick, Adewale Akinnuoye-Agbaje, and Katey Sagal (Married With Children) guest star; this episode introduces the Dharma Initiative to the series’ mysterious backstory.
ABC airs the 28th episode of the J.J. Abrams-produced series Lost. Adewale Akinnuoye-Agbaje and Cynthia Watros become series regulars; DJ Qualls guest stars.
ABC airs the 29th episode of the J.J. Abrams-produced series Lost.
ABC airs the 30th episode of the J.J. Abrams-produced series Lost. Malcolm David Kelley guest stars as Walt.
ABC airs the 31st episode of the J.J. Abrams-produced series Lost. Brett Cullen guest stars.
ABC airs the 32nd episode of the J.J. Abrams-produced series Lost. Francois Chau guest stars.
ABC airs the 33rd episode of the J.J. Abrams-produced series Lost. Frederic Lane guest stars.
ABC airs the 34th episode of the J.J. Abrams-produced series Lost.
ABC airs the 35th episode of the J.J. Abrams-produced series Lost. M.C. Gainey guest stars.
ABC airs the 36th episode of the J.J. Abrams-produced series Lost. Neil Hopkins guest stars.
ABC airs the 37th episode of the J.J. Abrams-produced series Lost. Kim Dickens guest stars.
ABC airs the 38th episode of the J.J. Abrams-produced series Lost. Mira Furlan (Babylon 5), Clancy Brown (Highlander, Earth 2) and Michael Emerson guest star.
ABC airs the 39th episode of the J.J. Abrams-produced series Lost. Mira Furlan (Babylon 5) and Michael Emerson guest star.
ABC airs the 40th episode of the J.J. Abrams-produced series Lost. Michael Emerson guest stars.
ABC airs the 41st episode of the J.J. Abrams-produced series Lost. Katey Sagal (Married With Children) and Michael Emerson guest star. Freeze-frame analysis of the episode’s mysterious map becomes a minor internet phenomenon in the wake of this episode’s broadcast.
ABC airs the 42nd episode of the J.J. Abrams-produced series Lost. Bruce Davison (Harry And The Hendersons, X-Men) and Michael Emerson guest star.
ABC airs the 43rd episode of the J.J. Abrams-produced series Lost. Wayne Pygram (Farscape) and Michael Emerson guest star.
ABC airs the 44th episode of the J.J. Abrams-produced series Lost. Michael Emerson guest stars.
ABC airs the 45th episode of the J.J. Abrams-produced series Lost.
ABC airs the 46th episode of the J.J. Abrams-produced series Lost. Malcolm David Kelley guest stars as Walt.
ABC airs the 47th episode of the J.J. Abrams-produced series Lost, bringing the second season to a cryptic close. Malcolm David Kelley, Michael Emerson, Clancy Brown, and Alan Dale (Angel, Torchwood) guest star.
ABC airs the 48th episode of the J.J. Abrams-produced series Lost, opening the show’s much-anticipated third season. Deep analysis of clues of the show’s backstory has now become a popular pastime, not simply an internet phenomenon. Elizabeth Mitchell (V), Michael Emerson, and Henry Ian Cusick join as series regulars; William Mapother and Brett Cullen guest star.
ABC airs the 49th episode of the J.J. Abrams-produced series Lost. Byron Chung guest stars.
ABC airs the 50th episode of the J.J. Abrams-produced series Lost. Ian Somerhalder reprises his first-season role as Boone; Kiele Sanchez and Rodrigo Santoro are introduced as new regulars Nikki and Paulo, a move much-derided by the show’s rapidly growing fandom.
ABC airs the 51st episode of the J.J. Abrams-produced series Lost. Kim Dickens guest stars.
ABC airs the 52nd episode of the J.J. Abrams-produced series Lost.
ABC airs the 53rd episode of the J.J. Abrams-produced series Lost. Nathan Fillion (Firefly) guest stars. The series will return in 2007, with the remainder of the third season airing without interruption.
ABC airs the 54th episode of the J.J. Abrams-produced series Lost. Guest star Nestor Carbonell makes his first appearance as Richard Alpert.