Sarah Michelle Gellar plays Buffy, the vampire slayer. Once from LA, Buffy moved with her mom to Sunnydale after she was expelled from her old school for burning down the gym (filled with vamps). Now permantly in Sunnydale, Buffy has accepted her slayage duties and fights all the forces of darknes, with a little help from her buds, Xander, Willow, Cordy and Oz.
In Becoming, Buffy revealed to her mother that she was a slayer. Confused, Joyce kicked her outta the house. Buffy was also expelled from school after principal Synder (a royal pain in the butt) found her with a murdered Kendra. Luckily, Buffy returned home in Anne and hopefully all will be goodness.
In season three, Buffy dealt with the loss of Angel, but when he came back, they got back together. Unfortunately, Angel decides to leave Sunnydale, breaking Buffy's heart.