Watch Criminal Minds Our Darkest Hour Season 5 Episode 23 Online Streaming this May 26, 2010, Wednesday at 9:00 PM on CBS tv network. Watch its all new full episode as the BAU faces one of its most difficult cases when a serial killer is lured out of hiding after a series of rolling blackouts in Los Angeles give him the opportunity to pursue his victims in the darkness. Watch Criminal Minds Our Darkest Hour Season 5 Episode 23 (S05E23) online streaming video at cbs.com.