Horror films typically follow certain conventions in their narratives, themes, characters, and stylistic elements. The narrative usually involves a hero or protagonist embarking on a mission to defeat a central villain, such as a serial killer or supernatural force. Common themes include good versus evil, the supernatural, science gone wrong, and madness. Character archetypes include victims, monsters, stupid teenagers, and survivors. Visual and audio elements like dark lighting, disturbing props, isolated settings, and tense music are used to build fear and terror in viewers.