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) episode of the "Buffy" series, and the one Nicholas Brendon (Xander) considers the most frightening. Series writer Jane Espenson stated the episode "redefined what an episode of television could do". Hush (Buffy the Vampire Slayer) "Hush" is the tenth episode in the fourth season of the supernatural drama television series "Buffy the Vampire Slayer" (1997–2003). It was written and directed by series creator Joss Whedon and originally aired in the United States on December 14, 1999 on The WB Television Network. After reading critical response to the series in which the dialogue was praised as the most successful aspect of