Dark Sector thrusts players into the role of Hayden Tenno, a covert operative sent on a dangerous 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 infected by a bio-weapon that has granted him inhuman abilities. Now, Hayden must learn to evolve along with his powers, to survive and to become a hero.