Battlestar Galactica
Litmus
S1 E6:
When a new copy of Doral, a Cylon who had been previously exposed while serving as the Galactica's public-relations officer, sneaks aboard and blows himself up, killing three people, Commander Adama and President Roslin must finally make public the terrifying secret known only to a select few: Cylons now look like humans.
Starring
Edward James Olmos, Mary McDonnell, Katee Sackhoff
Director
Rod Hardy