The Man In Black is the main antagonist of the TV Series Lost. The Man in Black is seen this form, briefly adopting the guise of several other dead characters and animals in some episodes, until Seasons 5 and 6 when he assumes the appearance of John Locke, and remains in this form until his death.
He is portrayed by Terry O'Quinn.
Immediately after the crash of Oceanic 815, the Man takes the form of Christian Shephard and instructs the dog Vincent to go find Jack Shephard (Matthew Fox). Then the Man in Black, in the form of the smoke monster, rips the pilot (Greg Grunberg) from the cockpit of the plane and kills him, leaving his mangled body in a tree; the pilot's corpse is found by Jack, Kate Austen (Evangeline Lily), and Charlie Pace (Dominic Monaghan). Later, the Man in Black as the smoke monster encounters John Locke (Terry O'Quinn) in the jungle, although he leaves Locke unharmed. John later tells Jack, "I looked into the eye of this island, and what I saw was beautiful." Locke would later tell Eko that he first saw a bright, beautiful light when seeing the monster the first time. Later, the Man in Black attacks the survivors as the monster again; he attempts to drag Locke down a hole but is stopped by Jack and Kate, who throw dynamite at the monster.
The Man in Black then confronts Mr. Eko (Adewale Akinnuoye-Agbaje) as the monster. As Eko stares down the Man in Black, he sees flashing images of his past. In a second instance, the Man in Black takes the form of Mr. Eko's brother, Yemi (Adetokumboh McCormack), and demands Mr. Eko to repent for his sins. When Eko refuses, the Man in Black briefly disappears, only to return as the monster. He then kills Eko by slamming him repeatedly against nearby trees and the ground. The Man in Black also appears to Juliet Burke (Elizabeth Mitchell) and Kate as the monster; during the encounter, the monster releases a series of bright flashes. The Man in Black reappears later, and it is revealed it cannot penetrate the sonar fence that surrounds the Barracks.
After becoming enraged over the death of his adoptive daughter Alex Rousseau (Tania Raymonde) at the hands of Charles Widmore (Alan Dale)'s mercenaries, Benjamin Linus (Michael Emerson) rushes to a hidden room below his home at the barracks, which has an ancient stone door covered with hieroglyphs; in the room, he drains a small pool, which summons the Man in Black as the monster to attack the mercenaries. As some of the survivors are preparing to leave the island, the Man in Black keeps Claire Littleton (Emilie de Ravin) company in the form of her father Christian Shephard (John Terry), and he tells her the Others took her son Aaron. When John Locke enters a cabin Horace Goodspeed had built in the '70s, the Man in the form of Christian Shephard falsely tells John he is giving instructions from Jacob, and tells him that he needs to move the Island.
When Hurley stumbled upon Jacob's cabin, he saw the figure of Christian Shephard in Jacob's rocking chair, wearing his usual outfit. He was also startled by a second figure peering through the window at him.
While the Barracks were under siege by the mercenary team, Ben summoned the Man in Black through a secret room in his house. He appeared as a single black cloud, larger than ever before, that ran parallel to the ground. He only injured one of the mercenaries seriously, but he caused a great deal of confusion and panic amongst his victims, who fired upon him in vain. Keamy grimly described the Monster as "a black pillar of smoke."
The Man in Black later held Aaron outside of Sawyer, Miles and Claire's camp. Miles saw Claire walk away with him in the night, calling him "dad".
When Locke entered Jacob's cabin, he met "Christian," whose form the Man in Black had previously taken, and who now claimed to be speaking on Jacob's behalf. He dodged questions about Claire, prompting Locke to ask, "How do I save the Island?" In response, the the sitting figure told him to "move the Island."
Soon afterward, "Christian" appeared to Michael on the Kahana, heralded by whispers. He told Michael that he could "go now" and the bomb Michael was trying to control detonated. If this figure was the Man in Black, he had managed to travel over the water to the freighter and managed to escape the ship's destruction.
At some point after residing with Christian Shephard in the cabin, Claire came to know the Man in Black enough to consider him her "friend". She later credited him with helping her survive in the jungle from attacks by the Others for the next three years. He falsely told her the Others had Aaron, allegedly to motivate her with hate. However, it was clear that she was not aware that "Her father" and "Her friend" were the same person, the Man in Black. This was proved when Claire told Jin-Soo Kwon that both her father and her friend informed her of Aaron's apparent whereabouts.
While Locke was trapped beneath the Orchid station in a frozen underground cave, the figure of Christian again approached him. He claimed that when he told Locke they must move the Island, he referred to Locke specifically. He told Locke to turn the frozen wheel, and confirmed Richard's statement that Locke would die trying to unite the Oceanic Six, calling it a "sacrifice." Moments before Locke turned the wheel, "Christian" asked Locke to say hello to his son.
Following Ajira 316's crash on the Island, the Man in Black appears as Christian Shephard to Sun and Lapidus, informing them of the time travel undergone by the rest of the Oceanic 6. He then takes the form of the deceased Locke, whose body was on the plane, and tricks everyone into thinking Locke was brought back to life. Later, Ben tells the Man in Black, who he thinks is Locke, that he must travel to the monster's lair, which lies beneath the temple wall, to be judged for his complicity in his daughter's death. The Man in Black separates from Ben at the Temple and confronts Ben as the monster. After the Man in Black retreats back into a vent, he reappears to Ben as Alex's manifestation, warning Ben to follow "Locke's" every word, to which he complies. The Man in Black (in the form of John Locke), Ben, and Sun Kwon (Yunjin Kim), arrive at one of the Others' camps. The Man in Black then instructs Richard to find a time-traveling Locke, and tell him he must die to bring his friends back to the island. Later, The Man in Black demands Richard take him and the Others to see Jacob, to which Richard reluctantly complies.
The next day, he tells Ben of his plan to kill Jacob. Later, Ben informs the Man in Black of Alex's threat, to which the Man in Black replies by telling Ben to kill Jacob. After arriving at Jacob's residence at the four-toed statue, the two enter and meet Jacob. Ben tells Jacob how he has sacrificed and suffered for the island but still had been ignored by Jacob. Ben then proceeds to stab Jacob, whom the Man in Black kicks into a fire.
Later, Jacob's protectors enter the statue and attempt to kill the Man in Black, who changes into the monster and kills them. After the men are all dead, the Man in Black reveals to Ben that his intention is to "go home." After exiting the statue, the Man in Black knocks out Richard and carries him into the jungle. Shortly after, the Man in Black offers Richard a second chance to join him, which Richard refuses. The Man in Black then tracks down a drunken Sawyer (Josh Holloway), who recently lost Juliet. Sawyer realizes the Man in Black is not John Locke, but agrees to follow him after he tells Sawyer why he is on the Island in the first place. Sawyer and the Man in Black eventually reach a cave near a ledge, which has writing all over its walls. The writings are all people's names with numbers beside them. The Man in Black reveals to Sawyer the names represent the candidates to replace Jacob. He then has Sawyer join him on a mission to leave the island.
Later, the Man in Black recruits Sayid to his side by promising him his love Shannon back. He requests Sayid deliver a message to the Others, warning them to leave the Temple by sundown or they will be killed. He also requests he kill Dogen, since Dogen being alive keeps the Man in Black from entering the Temple. After Sayid kills Dogen, the Man in Black enters the Temple as the monster and kills all the Others remaining inside. After this, he gathers the Others that joined him, along with Sayid, Claire, and Kate.
Soon after, the Man in Black sends Sawyer on a recon mission to Hydra Island. Sawyer returns from Hydra Island and tells the Man in Black all the Ajira passengers are dead and Charles Widmore and his team are on the other Island, where they have set up a sonar fence. After Jin is taken from his camp by Widmore's men, the Man in Black takes Sayid with him to Hydra Island. He arrives on Hydra Island by himself, and confronts Widmore. After warning Widmore, the Man in Black returns to the main island, while Sayid spies on Widmore's team. After Sayid comes back, he shows the Man in Black Desmond Hume (Henry Ian Cusick). The Man in Black takes Desmond to an old well. After explaining its origins, the Man in Black throws Desmond down the well. On returning to his camp, Hurley's group arrives to join him.
The Man in Black instructs Sawyer to get a sailboat and bring it to a meeting point. He also instructs Sayid to kill Desmond at the bottom of the well. Sawyer steals the boat and takes some of the survivors with him to the Hydra Island. Jack jumps off the boat since he doesn't think they should leave the Island, and washes up next to the Man in Black. Widmore uses artillery shells to bomb the Man in Black's group and they flee into the jungle. The Man in Black and Jack arrive at the Hydra Island with Sayid and rescue the survivors from Widmore. After the Man in Black then recovers C4 from the Ajira Flight 316, he and the survivors head to Widmore's submarine to leave the island. However, Sawyer steals the sub with all of the survivors and the candidates on it, except for Claire. Jack then discovers the Man in Black inserted the C4 into Jack's backpack with a timer attached to it. Sawyer tries to pull the wires out, but Jack tells him not to since he has figured out the Man in Black can't kill the candidates himself and wants them to kill each other. He asks Sawyer to let it run down to zero, but Sawyer pulls the wires out anyway. As a result, the timer speeds up and the bomb detonates. The aftermath results in the death of Jin, Sun and Sayid.
Later, The Man in Black arrives at the Barracks, and obtains information from Widmore that Desmond is immune to electromagnetism. After Ben kills Widmore, the Man in Black recruits him and reveals his plan to use Desmond to destroy the Island. The Man in Black finds Desmond and meets up with Jack's group on the way to the "heart of the island." After having Desmond remove the cork from the center of the "heart of the island", the Island proceeds to crumble. However, with the cork being removed from the "heart of the Island", the Man in Black is mortal again. During an intense fight with Jack, the Man in Black stabs him, but before he can finish Jack off, Kate shoots him in the back. Despite this, the Man in Black thinks they're "too late" to save the island, but Jack makes him realize his defeat, then kicks him off the cliff. The world was, as of now, no longer in danger from the Man in Black escaping from the island and Jack had won against the monster.