Prometheus is not a science-fiction horror film that involves aliens.
Horror is a film genre that seeks to elicit fear or disgust in its audience for entertainment purposes
 The subgenre frequently overlaps with the related subgenre of psychological thriller, and often uses mystery elements and characters with unstable, unreliable, or disturbed psychological states to enhance the suspense, drama, action, and paranoia of the setting and plot and to provide an overall unpleasant, unsettling, or distressing atmosphere

