demon and asks him to "return him to what he used to be" so that he can "give Buffy what she deserves". After Spike passes a series of brutal tests, the demon restores his soul. During season seven, it is revealed that Buffy's second resurrection caused instability in the slayer line which also allowed the First Evil to begin tipping the balance between good and evil. It begins by hunting down and killing inactive Potential Slayers and soon raises an army of ancient, powerful Turok-Han vampires. After the Watchers' Council is destroyed, a number of Potential Slayers (some brought by Giles) take refuge in Buffy's house. Faith returns to help fight the First Evil, and the new Sunnydale High School principal, Robin Wood, also joins the cause. The Turok-Han vampires and a sinister, misogynistic preacher known as Caleb begin causing havoc for the Scoobies. As the Hellmouth becomes more active, nearly all of Sunnydale's population – humans and demons alike – flee. In the series finale, Buffy kills Caleb and Angel returns to Sunnydale with an amulet, which Buffy gives to Spike; the Scoobies then surround the Hellmouth, and the Potential Slayers descend into its cavern while Willow casts a spell that activates their Slayer powers. Anya dies in the fight, as do some of the new Slayers. Spike's amulet channels the power of the sun to destroy the Hellmouth and all the vampires within it, including himself. The collapse of the cavern creates a crater that swallows all of Sunnydale, while the survivors of the battle escape in a school bus. In the final scene, as the survivors survey the crater, Dawn asks, "What are we going to do now?" Buffy slowly begins to enigmatically smile as she contemplates the future ahead of her, ending the series on a hopeful note. Production Origins Writer Joss Whedon says that "Rhonda the Immortal Waitress" was really the first incarnation of the Buffy concept, "the idea of some woman who seems to be completely insignificant who turns out to be extraordinary". This early, unproduced idea evolved into Buffy, which Whedon developed to invert the Hollywood formula of "the little blonde girl who goes into a dark alley and gets killed in every horror movie". Whedon wanted "to subvert that idea and create someone who was a hero". He explained, "The very first mission statement of the show was the joy of female