Call of Duty is a series of FPS games published by Activision and mainly developed by Infinity Ward, Treyarch, and Sledgehammer Games. It’s story starts from World War II and goes all the way to the future. The series' campaigns feature epic set pieces and fast-paced action, but its bread and butter is its multiplayer which features massive customization including equipment and perks from Modern Warfare onward. The Black Ops story arc also features the celebrated “Zombie Mode.”