Netflix is promoting its new original horror series Hemlock Grove with a viral digital marketing campaign called the World's Biggest Horror Challenge. The campaign dares fans to watch all 13 episodes of Hemlock Grove in one sitting while being monitored via webcam. Participants who complete the challenge will receive badges to share on social media and the chance to receive a horror film made by Eli Roth. The $150,000 campaign uses ads, banners, influencer outreach and social media to drive awareness and consideration among horror fans ahead of Hemlock Grove's April 19th release on Netflix.