The protagonists face off against hostile North Korean soldiers, heavily armed mercenaries, and a race of technologically advanced aliens known as the Ceph, who arrived on Earth millions of years ago and have recently been awakened. The series revolves around a group of military protagonists with “nanosuits”, technologically advanced suits of armor that give them enhanced physical strength, speed, defense, and cloaking abilities. Crysis is a first-person shooter video game series created by German developer Crytek.