Severus Snape is the Half-Blood Prince, and appears as both a hero/supporting protagonist and an antagonist/supporting antagonist of the Harry Potter Book and Film franchises. He appears as the false, believed main antagonist of Philosopher's Stone, a supporting protagonist and very minor antagonist of The Chamber of Secrets, a supporting protagonist/antagonist of Prisoner of Azkaban, a supporting antagonist of Goblet of Fire, a minor antagonist of Order of Phoenix, the secondary antagonist of Half-Blood Prince, a supporting antagonist of Deathly Hallows-Part 1 and a supporting protagonist of Deathly Hallows-Part 2.