The Jigsaw Killer, or simply known as Jigsaw (real name: Johnathan "John" Kramer), is the main antagonist of the horror film franchise Saw. He is the main antagonist of the first three films and the posthumous overarching antagonist of the subsequent films. He is a former civil engineer who, after going through several traumatic events, became a deluded and obsessive serial killer with the intention of teaching his victims that life is precious. He is probably most famous for intimidating his victims by using Billy the Puppet, a special small red and white kabuki-like doll.