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Jigsaw (Real Name: John Kramer) is the main antagonist of the Saw franchise. His most known appearance in the films is the Billy Puppet, a robotic puppet controlled by Jigsaw, which is his appearance in SMG4 (series). He is a minor villain in SM64 Halloween 2016 - SPAGHETTI.EXE, which is his only appearance in SMG4.
In the video, he is summoned by the Creepy Mario Statue, along with other creepy pastas and horror movie characters. He was then horribly destroyed by Slenderman and his martial art skills, likely killing him.