Buffy the Vampire Slayer
The series premiered on March 10, 1997, on The WB and concluded on May 20, 2003, on UPN. The series narrative follows Buffy Summers (played by Sarah Michelle Gellar), the latest in a line of young women known as "Vampire Slayers", or simply "Slayers". In the story, Slayers or the 'Chosen Ones' are "called" (chosen by fate) to battle against vampires, demons, and other forces of darkness. Being a young woman, Buffy wants to live a normal life, but as the series progresses, she learns to embrace her destiny. Like previous Slayers, Buffy is aided by a Watcher, who guides, teaches, and trains her. Unlike her predecessors, Buffy surrounds herself with a circle of loyal friends who become known as the "Scooby Gang".
Big Bad
The term "Big Bad" was originally used on American television program "Buffy the Vampire Slayer" (which aired 1997–2003). According to author Kevin Durand (2009), "While Buffy confronts various forms of evil during each episode, each season of Buffy the Vampire Slayer had its own 'big bad' villain who dominates throughout the season. The power of the 'big bad' always threatens to end the world, but Buffy ultimately overcomes him or her in the season finale."