Popsugar Entertainment Hbo Best HBO Documentaries | 2020 25 Powerful Documentaries You Can Watch on HBO Right Now 7 April 2020 by Hedy Phillips View On One Page Photo 4 of 25 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 4 The Truth About Killer Robots This documentary takes a wild look at the times when using robots has gone horribly wrong. Watch The Truth About Killer Robots on HBO. Previous Next Start Slideshow HBODocumentaries