Taka investigates the cult; Burton goes on a business trip and meets a mysterious CEO; Tess endures an unpleasant trip to her mother’s house and discovers difficult information.

Rebecca, Doc, and Hauser set out to capture musically-inclined serial killer Webb Porter (guest star Malek), an unknown ’63 that returns more violent than ever

Clarence Montgomery was the only innocent man in Alcatraz but he’s returned and is committing crimes. This episode was scheduled to premiere on February 27, 2012, however it was postponed…

When child killer Kit Nelson, a terrifying kidnapper who always returns his victims home – after he’s killed them – reappears from the past, the team is in a race…

When a sniper begins targeting young victims, the team is forced to retrace the steps of the past in order to solve this modern day mystery.

Operating within the Defense Criminal Investigation Service of the U.S. Department of Defense and led by preeminent neurologist and psychiatrist Dr. Lee Rosen, an expert in Alpha phenomena, the team…

Rachel and Chandler ask for six volunteers to participate in human trials of her vaccine, but the tests could be a living hell as the virus and the vaccine do…

Chandler’s leadership is put to the test when the ship’s propulsion system is in danger of breaking down, the crew becomes overworked and exhausted, and Dr. Scott could potentially lose…

The crew faces a new foe targeting Rachel and her research, leading Chandler to engage in a series of dangerous strategic maneuvers.

The crew members arrive at the Guantanamo Bay military base to collect food, fuel and medical supplies. When they come under attack by escaped Gitmo prisoners, they team up with…

Just as the walls start to close in on those trapped in Chester’s Mill, a possible exit from the dome is revealed.

Rebecca and Sam try to save Chester’s Mill residents as temperatures plunge; Barbie puts his life at risk to help Julia after a terrible accident.

Barbie turns to his father for help contacting Julia but realizes that he may not be trustworthy; Big Jim declares himself sheriff of Chester’s Mill.

A cave-in severs Barbie and Sam’s path back to Chester’s Mill during their investigation of a mysterious tunnel; a dust storm rages through the town, as Big Jim and Julia…

Barbie’s life is in Big Jim’s hands; the dome becomes magnetized; Julia tries to save the life of a mysterious girl who may have clues about the origin of the…

Secrets of the Dome are revealed and Big Jim is determined to put an end to Barbie once and for all. Meanwhile, Junior, Angie, Joe and Norrie discover who the…

Junior stands up to his father and is shattered when he discovers the truth about his mother’s past. Meanwhile, Julia learns firsthand the powers of the “mini dome.”

The Chester’s Mill residents receive an unexpected visit from their loved ones on the other side. Meanwhile, the community braces for a threat from outside the Dome.

Following Duke’s death, his house catches fire, forcing the town to rally together to form a bucket brigade. Elsewhere, Junior ambushes Barbie, while Dodee and Phil pick up a military…

While the gang begins to turn on itself, Tony finds himself at the threshold.

Things heat up between Ralphie and Johnny Sack after Ralphie’s rude remarks about Johnny’s wife become public. Tony is forced to plan a hit on Johnny, while Johnny puts out…

Tony finds himself singing the Christmas blues as the holidays approach. He and Furio retaliate against the Russian who beat Janice. Memories of Big Pussy haunt Tony, Sylvio and Paulie…

Bobby’s cancer-ridden father comes out of retirement to do a hit. Meanwhile, Junior is given some unpleasant news about his medical condition. Tony’s racism again boils to the surface when…

Jack, the new protector of the island, meets with Locke and they go past the bamboo field with Desmond to visit the heart of the island. The Man in Black’s…

The Man in Black’s final fate is determined, and one survivor must make the ultimate sacrifice to save the island. Meanwhile, in another life, the ones who might have been…

After the remaining survivors are reunited, Sawyer and Jack hatch a plan to divert the Man in Black’s attention and leave the island without him on Widmore’s submarine, but disastrous…

Desmond wakes up to discover he’s back on the island.

Locke tasks Sawyer with a mission.

Hurley must convince Jack to accompany him on an unspecified mission, and Jin stumbles across an old friend.

Jack, Sawyer, Kate, Miles and Hurley, struggling to save Sayid, face an ancient secret. Meanwhile, a fake Lock exits the chamber to everyone’s awe.

A parallel universe, in which the crash never happened, is revealed as an aftermath of the bomb’s detonation. Meanwhile, Sawyer blames Jack for the loss of Juliet and the true…

Jack’s decision to put a plan in action in order to set things right on the island is met with some strong resistance by those close to him, and Locke…

Jack’s decision to put a plan in action in order to set things right on the island is met with some strong resistance by those close to him, and Locke…

Suspicions about a possible breach intensify after Ben is taken from the infirmary, and a reluctant Miles is forced to work with Hurley when he’s asked to deliver an important…

After meeting old acquaintances Sawyer is forced to continue lying to protect them.

Locke’s mission off the island as Jeremy is revealed.

Hurley and Sayid are on the run from the cops after stumbling into trouble at the safehouse; the island survivors come under attack by unknown forces; and an old friend…

The face-off between the survivors and the freighter people continues, and the Oceanic Six find themselves closer to rescue.

Sayid goes back to the island to bring the rest of the people to the freighter. Ben, Locke, and Hurley go to another Dharma station in order to “move the…

Jack tries to discover the identity of a body that has washed ashore. Meanwhile, Locke’s camp is attacked by Ben’s adversaries.