The fourth season featured sixteen major roles with
star billing. The show continues to chronicle the lives of the survivors of the crash of
Oceanic Airlines Flight 815; the survivors' interactions with the island's original inhabitants, whom they refer to as "the Others"; and a group of people who arrived on a
freighter. The list is ordered by actors' last names, with brief summaries of the characters.
Main •
Naveen Andrews as 815 survivor
Sayid Jarrah, a former soldier of the
Iraqi Republican Guard. •
Henry Ian Cusick as
Desmond Hume, a man who has been living on the island for three years and who has developed the ability to time travel, though this is beyond his control. •
Jeremy Davies as
Daniel Faraday, a socially awkward physicist from the freighter. •
Emilie de Ravin as single new mother
Claire Littleton of Flight 815. •
Michael Emerson as
Ben Linus, the leader of the Others. •
Matthew Fox as Dr.
Jack Shephard, the leader of the castaways. •
Jorge Garcia as unlucky millionaire and mentally unstable
Hugo "Hurley" Reyes, one of Jack's fellow survivors of 815. •
Josh Holloway as the sardonic 815 survivor
James "Sawyer" Ford. •
Daniel Dae Kim as the non-English speaking
Jin Kwon •
Yunjin Kim as Jin's pregnant wife
Sun. •
Ken Leung as
Miles Straume, an arrogant
medium from the freighter. •
Evangeline Lilly as fugitive
Kate Austen. •
Rebecca Mader as anthropologist
Charlotte Lewis from the freighter. •
Elizabeth Mitchell as fertility specialist
Juliet Burke, a woman recruited by the Others who joins the 815 survivors in the third season and becomes involved in a love square with Jack, Kate and Sawyer. •
Dominic Monaghan as
Charlie Pace. Monaghan only received star billing in the episode in which he appeared. •
Terry O'Quinn as
John Locke, an 815 survivor with a deep connection to the
island. •
Harold Perrineau as Flight 815 survivor
Michael Dawson, who returns aboard the freighter undercover for Ben as a deckhand, after escaping the island in
Season 2.
Recurring •
Sam Anderson as
Bernard Nadler, a survivor of Oceanic Flight 815, who is Rose's husband • Anthony Azizi plays Omar, a
mercenary on the Kahana •
Blake Bashoff as
Karl, an Other, who is Alex's boyfriend •
Zoë Bell as Regina, a crew member of Kahana, who is involved with communications between the freighter and the island •
Grant Bowler as Gault, the captain of the Kahana, which is a freighter sent on a mission to find the island •
L. Scott Caldwell as
Rose Henderson, a survivor of Oceanic Flight 815, who is Bernard's wife •
Nestor Carbonell as
Richard Alpert, an Other, who does not age. While Ben is held in captivity, Richard is the leader of the Others. •
Alan Dale as
Charles Widmore, the man who funds the Kahana mission. He is also
Penelope "Penny" Widmore's father. •
Mira Furlan as
Danielle Rousseau, a marooned island inhabitant of sixteen years, who is reunited with her sixteen-year-old daughter,
Alex •
Kevin Durand as
Martin Keamy, the leader of the team of mercenaries on the Kahana •
Jeff Fahey as
Frank Lapidus, who was supposed to be the pilot of Oceanic Flight 815, but he was replaced. •
Malcolm David Kelley as
Walt Lloyd, a survivor of Oceanic Flight 815 •
Tania Raymonde as Alexandra "Alex" Rousseau. She is the biological daughter of Danielle Rousseau. She was kidnapped as a baby. Ben raised her and told her that she was his daughter. •
Lance Reddick as Matthew Abaddon, a mysterious man with connections to Naomi, Hurley, and Locke. •
Fisher Stevens as
George Minkowski, a crew member of Kahana, who is involved with communications between the freighter and the island •
John Terry as
Christian Shephard, who is Claire's and Jack's biological father. Claire does not meet him until she is a teenager or young adult. Jack does not know he has a half sister until he is an adult. •
Marsha Thomason as
Naomi Dorrit, a young woman who arrived on the Kahana •
Marc Vann as Ray, the doctor for Kahana's crew •
Cynthia Watros as
Libby, a survivor of Oceanic Flight 815. The actress was initially contracted to return for multiple episodes in the season to explore the character's mysterious backstory, but this was scrapped due to the
2007–08 Writers Guild of America strike. == Production ==