Jack Hangreave is the CEO of CELL and the main antagonist of Crysis 2. He formed CELL alongside his business partner Karl Ernst Rasch. Hangreave also stole Ceph technology from the Tunguska Event and used it to create the nanosuit worn by U.S. special forces. He seeks to destroy the Ceph, even if it means hindering Prophet in his own quest to stop the Ceph.