Dark Sector thrusts players into the role of Hayden Tenno, an elite black-ops agent sent on a dangerous assassination mission into Lasria, an Eastern European city on the brink of ruin that hides a deadly Cold War secret. Attacked by an unknown enemy, he awakens to find part of his body altered by an infection that has granted him inhuman abilities. Now, Hayden must learn to evolve along with his powers, to survive and to become a hero.