Alyson Hannigan 1989, her first regular role on a TV series came when she was cast in the short-lived ABC sitcom "Free Spirit". As a teenager, Hannigan babysat for the children of her future "How I Met Your Mother" costar, Bob Saget. In 1997, Hannigan was cast to play Willow Rosenberg, Buffy Summers' best friend, on the television series "Buffy the Vampire Slayer". The show became a success, and Hannigan gained recognition, subsequently appearing in several films aimed at teenaged audiences, including "American Pie" (1999), "Boys and Girls" (2000), "American Pie 2" (2001), and "American Wedding" (2003). She also had a guest
Slayer (Buffy the Vampire Slayer) then ends, and it's unknown what comes next. Slayer (Buffy the Vampire Slayer) A Slayer, in the television series "Buffy the Vampire Slayer" and "Angel" (both created by Joss Whedon), is a young female bestowed with mystical powers that originate from the essence of a pure-demon, which gives her superhuman senses, strength, agility, resilience and speed in the fight against forces of darkness. She occasionally receives prophetic dreams in the few hours that she sleeps. The opening narration in the Buffy series states "Into every generation a slayer is born: one girl in all the world, a chosen one. She