Martin Keamy

First Sergeant Martin Christopher Keamy is a fictional character played by Kevin Durand in the fourth season and sixth season of the American ABC television series Lost. Keamy is introduced in the fifth episode of the fourth season as a crew member aboard the freighter called the Kahana that is offshore the island where most of Lost takes place. In the second half of the season, Keamy served as the primary antagonist. He is the leader of a mercenary team hired by billionaire Charles Widmore (played by Alan Dale) that is sent to the island on a mission to capture Widmore's enemy Ben Linus (Michael Emerson) from his home, then torch the island.

Unlike Lost's ensemble of characters who, according to the writers, each have good and bad intentions, the writers have said that Keamy is evil and knows it. Durand was contacted for the role after one of Lost's show runners saw him in the 2007 film 3:10 to Yuma. Like other Lost actors, Durand was not informed of his character's arc when he won the role. Throughout Durand's nine-episode stint as a guest star in the fourth season, little was revealed regarding Keamy's life prior to his arrival on the island and Durand cited this as a reason why the audience "loved to hate" his villainous character. Critics praised the writers for breaking Lost tradition and creating a seemingly heartless character, while Durand's performance and appearance were also reviewed positively. Keamy returned in the final season for a tenth and eleventh appearance.