Cameras capture something shocking in a cemetery: empty graves, as if the dead walked out in the middle of the night; using cutting-edge tech, experts investigate what's behind this apparent evidence of zombie activity. Stories: 1) Moscow Mayhem; ... (more) 2) Missing Dead; 3) Death Truck; 4) Mekong Monster; 5) Impossible Cloud

Adam Hadhazy, Brian Wolshon, Carin Bondar, Carlo Muñoz, Chris Walcek, Conor McCourt, Craig Gottlieb, Deborah Hyde, Devin Dennie, Erica Lukes, George Kourounis, Greg Szulgit, Jeff Wise, Joe Pappalardo, Jon Farrow, Kiki Sanford, Lindsay Moran, Martin K.A. Morgan, Matt Kutcher, Michio Kaku, Roland Kays, Sian Proctor, Simon Foster, Tony McMahon