>> we have about 2,000 identified al qaeda in the facility. they're very hard to break. >> you have shields up here to protect us. everyone is crowded around looking at us now. >> this is not a place that you want to hang around. we don't want to stand here that much longer because they will now organize around us. >> there were beatings, unexplained prisoner deaths, and several dangerous jihadis escaped. into this cauldron, one day in early 2004, a new man arrived. we know him now as abu bakr al baghdadi, the leader of isis. and, yes, he was in american custody during the iraq war. al baghdadi has shown his face publicly only once.