roughly ten years after John's death in Saw III. When a new Jigsaw game leaves several people dead, the police come to believe that either John has been resurrected, or a Jigsaw copycat is involved. It is eventually revealed that Logan Nelson is the new Jigsaw Killer, and that he recreated the game he was once part of using new victims. At the end of the film, Logan abducts corrupt detective Brad Halloran and kills him as revenge for him being indirectly responsible for the death of Logan's wife. Having successfully framed Halloran as the killer, Logan escapes and is free to continue Jigsaw's work. Spiral takes place an unknown amount of time after John's death, as another Jigsaw copycat creates their own games to punish corrupt police officers and detectives. The case is investigated by Detective Zeke Banks, who eventually discovers that his new partner, Detective William Schenk, is the killer. Schenk kidnaps Banks' father Marcus, who is largely responsible for the corruption in the police department, and reveals that his own father was killed by a dirty cop and that he hopes to recruit Banks as a partner in cleansing the department of corruption. Banks is then forced to choose between killing Schenk or saving his father; he manages to rescue Marcus, but Schenk calls a SWAT team and makes it appear that Marcus is the aggressor and is holding a gun. Schenk then escapes as the SWAT team restrains Banks and shoots Marcus to death. Recurring elements Billy Billy is a puppet resembling a ventriloquist's dummy, sometimes seen riding a tricycle, that has appeared throughout the films and has become a type of mascot for the series. It is used by the Jigsaw Killer to communicate with his victims by delivering televised messages or occasionally in person to describe details of the sadistic traps and the means by which the victims could survive. Viewers have sometimes incorrectly identified the puppet itself as Jigsaw, because of its presence and connection to the killer. Age and use of the puppet over the course of the films necessitated its reconstruction. According to Wan, the original puppet's face for Saw involved clay, papier-mâché, and black ping-pong balls with the irises painted in for the eyes, but in later films more sophisticated construction included waterjet-cut foam for the body and remote-controlled animatronics. The endurance and popularity of the franchise has resulted in