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
Unofficial Buffy the Vampire Slayer productions Unofficial Buffy the Vampire Slayer productions The fictional universe established by television series "Buffy the Vampire Slayer" and "Angel" and the film "Buffy the Vampire Slayer" has been parodied or paid tribute to by a number of unofficial productions, most notably fan films and adult films. Several notable fan films have been inspired by the Buffyverse. Although 20th Century Fox and its licensees are the only organizations legally allowed to create any commercial products with the name and trademark "Buffy" and "Angel", related fan films have become more common, as computer and digital technology has advanced, to allow films to