The scariest stories are always about something that feels real. This seems to be the philosophy embraced by National Geographic’s eerie The Hot Zone trailer. After an unsettling opening shot depicting a drop of ambiguous fluid slowly flowing downward, series star Julianna Margulies informs us that we are in “one of the deadliest places on Earth,” and within moments you believe it. Intercutting between teasing the horrors of an unchecked Ebola outbreak and tender shots of the innocents it would slaughter, the tension in this brilliant trailer does not let up.