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
Vampire (Buffy the Vampire Slayer) Vampire (Buffy the Vampire Slayer) In the fictional world of the television series "Buffy the Vampire Slayer" and its spin-off series "Angel", a vampire is a unique variety of demon that can only exist on the earthly plane by inhabiting and animating a human corpse. In "Fray", a "Buffy" comic book spin-off set about a century in the future, vampires are also called lurks. The vampires in the canonical Buffyverse differ greatly from those that appear in the 1992 "Buffy the Vampire Slayer" movie. The movie's vampires are able to fly, look pale but relatively human, and do not crumble