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.