Part 3 of the 4-part “Insurgency.” The cockroaches take their guerilla war to a frightening new level, staging suicide attacks on the Los Angeles power grid. Is it six-legged heroism, or insect terrorism? As the resulting outages lead to mass panic, man turns against man, paving the way for a roach revolution. And Nils reveals a secret deep in Bug Bee Co.’s past that may shed light on the horror.