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
The Gift (Buffy the Vampire Slayer) The Gift (Buffy the Vampire Slayer) "The Gift" is the fifth season finale, and the 100th episode, of the fantasy-horror television series "Buffy the Vampire Slayer" (1997-2003). The episode serves as the "WB Finale" of the series, as it moved to the UPN channel for the remainder of the series. The premise of "Buffy the Vampire Slayer" is that an adolescent girl, Buffy Summers, is chosen by mystical forces and given superhuman powers to kill vampires, demons, and other evil creatures in the fictional town of Sunnydale. She is supported by a close circle of family and friends, nicknamed the