Killer BOB

"Through the dark of futures past, the magician longs to see. One chants out between two worlds, Fire walk with me! I'll catch you with my death bag. You may think I've gone insane, but I promise I will kill again!"

- Bob speaking as Leland Palmer.

Killer BOB is the primary antagonist, a personification of evil in Twin Peaks. He is a demonic entity who feeds on fear and pleasure. He possesses human beings and then commits acts of rape and murder in order to feast upon his victims.

Story
Killer BOB is a demonic entity from the Black Lodge, a realm of pure evil which exists on an alternate plane of reality. He spends most of his time on Earth possessing human beings, although he also travels in the form of an owl. While possessing humans, he commits horrible crimes to elicit pain, fear, and suffering from those around him; these feelings, which Black Lodge residents refer to collectively as garmonbozia act as a form of nourishment. Physically, garmonbozia takes the shape of creamed corn. Creamed corn is referenced in the series when Laura Palmer’s best friend Donna takes over Laura’s “meals on wheels” route and accidentally serves the Tremonds (the little boy with the white mask and the old lady) creamed corn. In the film Fire Walk With Me, MIKE accuses Leland of stealing the corn he had canned “above the store.” Secondly, garmonbozia refers to “pain and suffering.” BOB, and possibly MIKE or other inhabitants of the Lodge, feed on garmonbozia as it is mentioned by name and/or description throughout the series and movie by Mike, Bob, the Tremonds, and The Man from Another Place.

Dale Cooper first learns of Killer BOB's existence in a vision, in which he encounters another entity named MIKE. In this vision, Cooper learns that BOB was in life a serial killer who raped and murdered young women with MIKE as his accomplice; MIKE eventually repented, removing his left arm in order to be rid of the tattoo that he shared with BOB. At the beginning of the second season, one of BOB's intended victims, Ronnette Pulaski, awakens from a coma induced by her torture at BOB's hands, at which time she identifies BOB as Laura's killer. Cooper and the Twin Peaks Sheriff department canvass the town with wanted posters of BOB, using Andy's sketch; Leland Palmer, Laura's father, identifies the man in the poster as "Robertson", and says that he lived near his grandfather and used to taunt Leland when he was a child.

It is later revealed that BOB is, in fact, possessing Leland, and has been possessing him ever since Leland first met him as a child at his grandfather's house. Under BOB's influence, Leland molested, raped, and finally murdered his own daughter. Cooper later determines that BOB is possessing Leland, and tricked him into a trap, in which BOB responds with taunting Cooper before forcing Leland to commit suicide. In his dying breaths, Leland states when he was a child he saw BOB in a dream and invited him inside, before stating that he never knew when BOB was in control of his body. After Leland dies, Cooper engages in a philosophical debate with Sheriff Truman and Albert Rosenfield over how real BOB was, and whether or not BOB was in fact a physical incarnation of Leland's repressed personal demons. Although the men cannot agree on a unifying idea, they do come to the conclusion that BOB is a manifestation of "the evil that men do".

Following Leland's death, BOB takes the form of an owl in the woods outside Twin Peaks, and isn't seen again for a while. In the final episode, Cooper ventures into the Black Lodge to apprehend his former partner, rogue FBI Agent Windom Earle, who is attempting to harness the power of the Lodge for himself. When Earle tries to strike a bargain with Cooper in which Cooper will sell his soul to Earle in exchange for Earle not murdering Cooper's lover, Annie, BOB appears, causing time in the Lodge to reverse to the moment before Cooper agreed to sell his soul. BOB informs Cooper that the Black Lodge is his domain, and thus Earle has trespassed by coming into it and demanding Cooper's soul for himself. As a punishment, BOB kills Earle, taking Earle's soul for himself. Cooper attempts to flee, but BOB traps Cooper in the Lodge, exiting in the form of a doppelganger of Cooper. The series ends with a maniacally laughing BOB examining his new body in a mirror.

Conception of Character
The impetus for the series Twin Peaks was the mystery of who killed Laura Palmer. When production began on the pilot episode, "Northwest Passage", series creators David Lynch and Mark Frost had decided that the murderer would be revealed as Leland Palmer, Laura's father. During the filming of a scene in the pilot taking place in Laura's room, Frank Silva, a set dresser during the shootings but also an actor, accidentally trapped himself in the room prior to filming by inadvertently moving a dresser in front of the door. Lynch had an image of Silva stuck in the room and thought that it could fit into the series somewhere, and told Silva that he would like for him to be in the series. Lynch had Silva crouch at the foot of Laura's bed and look through the bars of the foot-board, as if he were "trapped" behind them, and filmed it, then had Silva leave the room and filmed the empty room; after reviewing the footage, Lynch liked the presence that Silva brought to the scene and decided that he would put him somewhere in the series.

Later that day, a scene was being filmed in which Palmer's mother experiences a vision which frightens her; at the time, the script did not indicate what Mrs Palmer had seen to frighten her. Lynch was pleased with how the scene turned out, but a crew member informed him that it would have to be re-shot, because a mirror in the scene had inadvertently picked up someone's reflection. When Lynch asked who it was, the crew member replied that it had been Silva. Lynch considered this a "happy accident," and decided at that point that the unnamed character to be played by Silva would be revealed as Palmer's true killer.