Sayid Jarrah (Naveen Andrews) is one of the survivors of an Oceanic flight that crashes on a mysterious island in "Lost." He is a former Iraqi soldier and an expert in technology, war and torture. It is discovered through flashbacks that Sayid had a very sad past. He served as a soldier in the Gulf War in Iraq and became a torturer, making enemies give up their secrets. Sayid secretly loathed this about himself and longed to act as the good person he really was inside. During the war he gets the opportunity to save the life of a woman he knew when he was younger. Nadia (Andrea Gabriel) is being held prisoner and Sayid is ordered to execute her. Sayid has strong feelings for Nadia and helps her escape. After the Gulf War, even though he fears she might be dead, Sayid continues to look for his lost love. He was heading to Los Angeles to look for Nadia when the plane crashed.
On the island Sayid acts as a leader among the group. His controlled way of dealing with problems and willingness to explore any option to accomplish rescue earn him the respect of most of the other passengers. While on a hunt to find the source of a mysterious cable on the beach, Sayid is kidnapped by the crazed Danielle Rousseau (Mira Furlan). He escapes from Rosseau armed with maps to possibly aid in the rescue of the passengers. While trying to decipher the maps, which are in French, Sayid enlists the aid of Shannon (Maggie Grace), and they form an unlikely bond. Sayid shows a different side of his character when he is with Shannon. Later, Shannon's death sends Sayid into a state of grief, and he vows to avenge her death.
Sayid becomes one of the "Oceanic 6, " who leave the island and becomed rescued. In the United States, Sayid reunites with his long-lost love, Nadia and they marry. He is ready to settle down and find happiness living a more normal life. Unfortunately, Nadia is suddenly killed and Sayid becomes a pawn in a plot engineered by Benjamin Linus (Michael Emerson) to help him bring down Charles Widmore (Alan Dale). Ben convinces Sayid that Widmore was behind Nadia's death and forces Sayid to become an assassin, ready to kill all of Widmore's associates.
Sayid returns to the island after being captured by a woman he believes is a bounty hunter. Ilana (Zuleikha Robinson) claims to be escorting Sayid to Guam, but he quickly learns that he will be returning to the island against his will. Back on the island Sayid encounters a young Ben Linus, whom he tries to kill. Sayid is eventually shot and dies. He is revived by the waters flowing through the island's temple, though the revived Sayid has changed, and is not the person he was.
Sayid's final redemption comes when he saves the lives of several of the passengers in a submarine which is about to explode. Sayid believed that his past defined him as a man, but in the end, he proved himself as more than just a killer.
"Quite definitely. I do this for all the girls I meet on deserted islands."
To Locke about Ben: "Forgive me, but the day I start trusting him is the day I would've sold my soul."
"You were right about me... I am a killer."