In this episode of our narcissistic figures in history documentary series, we explore the psychology of powerful leaders like Reinhard Heydrich, Josef Mengele, and Kim Il Sung.

When does a belief system become a license to kill? We profile the "true believers" who lacked any human conscience. From the cold, calculating arrogance of the "Butcher of Prague" to the god-like status constructed by North Korea’s founder, we investigate how malignant narcissism allows individuals to justify the hor...