Madam Secretary Season 6 Episode 3 Killer Robots ( Air Date 2019-10-20 ) Genre Drama, War & Politics category. Overview "Elizabeth must decide whether to use autonomous unmanned weapons or send U.S. soldiers to bring the mastermind of the UN gas attack to justice. Also, Blake is questioned by Senator Hanson about potential campaign finance violations related to his love life, and Henry and Elizabeth search for the perfect dog.".