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
Master (Buffy the Vampire Slayer) Thus, she is fatally vulnerable to being hypnotized by Drusilla (Juliet Landau), an insane vampire with extraordinary mental abilities, who kills Kendra easily. Master (Buffy the Vampire Slayer) The Master is a fictional character on the action-horror/fantasy television series "Buffy the Vampire Slayer" (1997–2003). He is a centuries-old vampire portrayed by Mark Metcalf, determined to open the portal to hell below Sunnydale High School in the fictional town of Sunnydale where the main character Buffy Summers lives. The premise of the series is that Buffy (Sarah Michelle Gellar) is a Slayer, a teenage girl endowed with superhuman strength and other