Sunnydale High were remodeled to appear as the interior hallways of UC Sunnydale. Some of the exterior shots of the college Buffy attends, UC Sunnydale, were filmed at UCLA. Several episodes include shots from the Oviatt Library at CSUN. The exterior of the mansion where Angelus, Spike, and Drusilla lived was Frank Lloyd Wright's Ennis House. Format Buffy is told in a serialized format, with each episode involving a self-contained story while contributing to a larger storyline. Each season's storyline is broken down into season-long narratives marked by the rise and defeat of a powerful antagonist, commonly referred to as the "Big Bad". While the show is mainly a drama with frequent comic relief, most episodes blend different genres, including horror, martial arts, romance, melodrama, farce, fantasy, supernatural, comedy, and even, in one episode, musical comedy. The series' narrative revolves around Buffy and her friends, collectively dubbed the "Scooby Gang", who struggle to balance the fight against supernatural evils with their complicated social lives. The show mixes complex, season-long storylines with a villain-of-the-week format; a typical episode contains one or more villains, or supernatural phenomena, that are thwarted or defeated by the end of the episode. Though elements and relationships are explored and ongoing subplots are included, the show focuses primarily on Buffy and her role as an archetypal heroine. Gellar described the show as "the ultimate metaphor: horrors of adolescence manifesting through these actual monsters. It's the hardest time of life." In the first few seasons, the most prominent monsters in the Buffy bestiary are vampires, which are based on traditional myths, lore, and literary conventions. As the series continues, Buffy and her companions fight an increasing variety of demons, as well as ghosts, werewolves, zombies, and unscrupulous humans. They frequently save the world from annihilation by a combination of physical combat, magic, and detective-style investigation, and are guided by an extensive collection of ancient and mystical reference books. Storylines Season one exemplifies the "high school is hell" concept. Buffy Summers has just moved to Sunnydale after burning down her old school's gym and hopes to escape her Slayer duties. Her plans are complicated by Rupert Giles, her new Watcher, who reminds her of the inescapable presence of evil. Sunnydale High is built atop a Hellmouth, a portal to demon dimensions that attracts supernatural phenomena to the area. A mysterious man, Angel, warns Buffy of upcoming danger. She eventually