Twenty years after the events of Crysis 2, and New York has been coverd with a giant 'Nanodome' by a corrupt corporation, CELL. They used Ceph alien technology to develop unlimited energy, but it's clear that this has not liberated humanity. Humanity seems in worse shape than ever, in fact. You play Prophet once again, in the incredibly powerful Nanosuit. Prophet joins the rebellion against the CELL Corporation, while being plagued by visions of the powerful alien 'Alpha Ceph'.