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
Intervention (Buffy the Vampire Slayer) comic relief during a period of particular grimness for her character was a "bonus... an extra scoop of ice-cream," says Espenson. In the fight scenes in "Intervention", Xander was played by Nicholas Brendon's identical twin, Kelly Donovan, because Nicholas suffered from pneumonia at the time. Intervention (Buffy the Vampire Slayer) "Intervention" is the eighteenth episode in the fifth season of "Buffy the Vampire Slayer". At the Summers's home after dinner, Buffy confesses to Giles that she's worried about her ability to love. Giles suggests he and Buffy go to a sacred location in the desert so that she can undergo