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
Mayor (Buffy the Vampire Slayer) Mayor (Buffy the Vampire Slayer) Richard Wilkins III (commonly referred to as The Mayor) is a fictional character in the fantasy television series "Buffy the Vampire Slayer" (1997–2003). Portrayed by Harry Groener, he is the mayor of Sunnydale, a fictional town rife with vampires and demons in which the main character, Buffy Summers (Sarah Michelle Gellar) lives. The premise of the series is that Buffy is a Slayer, a young girl endowed with superhuman powers to fight evil, which she accomplishes with the help of a small group of friends and family, called the Scooby Gang. During the show's second