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
Adam (Buffy the Vampire Slayer) Adam (Buffy the Vampire Slayer) Adam is a fictional character in the fourth season of the television series "Buffy the Vampire Slayer". Portrayed by George Hertzberg, he is a monster created from a man and the collected parts of demons, vampires, and technology: the product of a perverse experiment carried out by military scientists. The series' main character, Buffy Summers, encounters and ultimately defeats him in the fourth season. Adam is the creation of Dr. Maggie Walsh (Lindsay Crouse), the head of a military-like organization called The Initiative that studies how to alter the harmful behavior inherent to demons. Adam