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.

For Lizzy Caplan, joining Netflix's "Zero Day" was an easy decision to make, citing Robert De Niro's involvement, as well as the "solid" credentials of co-creators Eric Newman, Noah Oppenheim and Michael Schmidt.

In the political thriller limited series, "Zero Day," the hero is Robert De Niro. The 81-year-old legend portrays George Mullen, a retired and well-loved President of the United States who is tapped to lead the commission investigating the cyberattack on America.