This interview contains spoilers from all six episodes of "Zero Day," now streaming on Netflix. Lizzy Caplan always knew that her character, Congresswoman and former First Daughter Alexandra Mullen, was behind the catastrophic cyberattack that incited the existential and moral panic that runs through "Zero Day.

Angela Bassett, Joan Allen, Connie Britton, Jesse Plemons and Lizzy Caplan co-star in a series about politicians trying to find answers after a deadly cyberattack.

Let's break down the explosive series finale of Netflix's "Zero Day," a cautionary tale about autocracy, misinformation and cyberterrorism.