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
Grave (Buffy the Vampire Slayer) Contner says that while filming the scenes with Willow and Xander on the cliff, the wind churned up dust, which blew into Alyson Hannigan's eyes. Because of the dust, Hannigan removed her black contacts and her eyes were blackened digitally in post-production. Grave (Buffy the Vampire Slayer) "Grave" is the sixth-season finale of the television series "Buffy the Vampire Slayer". This episode is the second highest rated Buffy episode ever to air in the U.K. Sky One aired the episode, which reached 1.22 million viewers on its original airing. This is the only "Buffy" season finale not written and directed