Our Darkest Hour
- Episode aired May 26, 2010
- TV-14
- 42m
The BAU is called to California when a sadistic serial killer appears and begins killing people in the dark during the rolling blackouts.The BAU is called to California when a sadistic serial killer appears and begins killing people in the dark during the rolling blackouts.The BAU is called to California when a sadistic serial killer appears and begins killing people in the dark during the rolling blackouts.