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
Unaired Buffy the Vampire Slayer pilot she is "The Slayer". One vampire runs away, and Buffy is left to dispatch the blond vampire. The next morning, Giles is unimpressed by Buffy's sloppy fighting and the fact that she allowed others to find out her identity as the Slayer. Her new friends, Willow and Xander, defend her, but Buffy is unbothered. Whedon was interviewed by "IGN Film Force" in June 2003 and was asked about the unaired presentation: Unaired Buffy the Vampire Slayer pilot The non-broadcast pilot episode of "Buffy the Vampire Slayer" was produced by 20th Century Fox in 1996 to pitch a series to networks.