While Attack On Titan isn't strictly a horror series, some of the scenes of Titans eating human beings are truly unnerving, such as the death of Mike in season 2. Related: Attack on Titan: Eren's Founding Titan Powers Explained While both films have their moments, they suffered from condensing the story down and omitting fan favorites like Levi. The franchise has received numerous video games and two live-action films from Japan. While the premise could have easily been silly the Titans themselves are genuinely unsettling creatures and neither the manga nor anime are afraid of a little bloodshed. The Attack On Titan anime series later debuted in 2013 and the franchise's popularity has only increased over the years. It's no mere action series, however, with many shocking twists and deaths occurring as the story unfolds. The manga was created by Hajime Isayama and sees what's left of the humanity sheltering behind a large walled city from man-eating giants, but when a Colossal Titan appears one day and breaches their outer defenses, mankind is forced to fight back. What exactly drives the Titans to eat people in Attack On Titan? Horrible pun aside, it's no exaggeration to state that Attack On Titan has become a giant franchise.