 The two agents soon learn that they are doomed to failure from the start, as the U.S. government is attempting to cover up the existence of American POWs still being kept in Vietnam.Gordon was inspired to write the episode after viewing an installment of the news series "60 Minutes" that dealt with American secret agents the CIA left behind during the Vietnam War.The eventual concept that the assassin could create blind spots came after the writer spoke with his ophthalmologist brother.