High Quality Content by WIKIPEDIA articles! Adam is a fictional character in the fourth season of the fantasy 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 and the Initiative are the fourth season`s primary antagonists, or Big Bad.