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
Hush (Buffy the Vampire Slayer) fourth most frightening episode in television history. Jarett Wieselman of the "New York Post" listed the scene in which Buffy mimes staking The Gentlemen and its humorous misunderstandings by the other characters among the top five best "Buffy" moments, especially praising Sarah Michelle Gellar's (Buffy) comedic acting. Nikki Stafford, author of "Bite Me! The Unofficial Guide to Buffy the Vampire Slayer" writes "Hush" is "mind-blowing" and "one of the best hours of television ever". For Buffy studies scholar Roz Kaveney, the primary reason "Hush" was successful was the acting strengths of the central cast. "Hush" is Alyson Hannigan's (Willow) favorite