As a terrorism network, ISIS (the Islamic State in Iraq and Syria) has attacked Westerners and non-supportive Muslims worldwide, killing and wounding thousands. Explore the roots of ISIS, how it plans attacks and recruits adherents, and global efforts to stop the group.

Nightmare in Paris -- The origins of savagery -- From insurgency to Caliphate -- The Kingdom of God -- A challenger to the world order -- Apocalypse now.