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
Help (Buffy the Vampire Slayer) kind of things teenagers do on the internet she refers to posting love poems and creating "Doogie Howser" fan fiction. The star of "Doogie Howser" is Neil Patrick Harris who would later star alongside Alyson Hannigan in "How I Met Your Mother", and alongside future potential slayer Felicia Day in Joss Whedon's "Doctor Horrible's Sing-Along Blog". Willow's question to Buffy, "Have you Googled her yet?", is the earliest use of Google as a verb on American television. Help (Buffy the Vampire Slayer) "Help" is the fourth episode of the seventh and final season of the television series "Buffy the Vampire