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
Chosen (Buffy the Vampire Slayer) nine on their list of 20 Best TV Series Finales Ever. L.A. Times also named the episode number 13 as their most memorable TV series finales. Chosen (Buffy the Vampire Slayer) "Chosen" is the series finale of the television series "Buffy the Vampire Slayer", the 22nd episode of season 7 and the 144th episode of the series. It was written and directed by series creator Joss Whedon and originally aired on UPN on May 20, 2003. The "Buffy" story would not be continued beyond this point until "The Long Way Home", a comic book, in 2007. A bloody Caleb rises