A search and recovery team heads into the haunted swamp to pick up the pieces, and Marybeth learns the secret to ending the voodoo curse that has left Victor Crowley haunting and terrorizing Honey Island Swamp for decades.

Plot Synopsis:
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The film picks up immediately after the end of the last film 'Hatchet II', with Marybeth Dunston (Danielle Harris) blowing off the head of Victor Crowley (Kane Hodder) with a shotgun. She walks away and comes across the bodies of Vernon and John, where she hears Crowley in the woods. Marybeth starts up the chainsaw, but is grabbed by Victor. Marybeth kicks him, and he falls backwards onto the chainsaw, cutting him down the middle. She grabs a shotgun from one of the men and shoots Victor's head, and walks back into the city.

Marybeth walks into the Jefferson Parish Police Department, immediately having guns drawn on her. Upon discovery of the twenty to thirty bodies at Honey Island Swamp, she is placed as the prime suspect in the murders by Sheriff Fowler (Zach Galligan), even after telling him numerous times about the events of the last two films. The Sheriff heads out to the swamp with the paramedics and fire department, leaving Deputy Winslow (Robert Diago DoQui) in charge of the station until he gets back.

Amanda Fowler (Caroline Williams), the Sheriff's ex-wife, journalist and Victor Crowley expert, comes into the station to interview Marybeth about what happened, telling Marybeth she wants to help, otherwise Marybeth will be tried and executed for what happened at Honey Island Swamp. After retelling the events of the previous two films to Amanda, Amanda tells her that Victor Crowley is a repeater, set to relive the night he died, looking for his father and that he will keep coming back unless he gets what he wants: his father. She tells Marybeth that her father, Sampson Dunston, was the one that came up with the idea to start the fire many years ago and tried to get him to deliver Thomas Crowley's ashes to Victor over the past several years, only to be pushed to the side numerous times. Since he's dead and she's Sampson's bloodline, only she can put an end to Victor Crowley. Marybeth doesn't believe her, continuously declaring that she killed Victor Crowley the night before.

At Honey Island Swamp, the body of Victor Crowley is bagged and tagged and put into the ambulance boat. When the paramedic, Randy (Sean Whalen) is distracted, Victor reanimates and blows Randy's head off with a defibrillator. Victor then escapes back to his house. Deputy Hamilton (Jason Trost) goes to investigate and goes to the boat where Victor appears and kills him by hacking his head in half. Victor then kills 10 other fire department officials and paramedics, leaving Andrew (Parry Shen), Rick and another missing paramedic alive. In comes the SWAT team, led by Hawes (Derek Mears) and consists of six other armed men and one armed woman named Dougherty (Rileah Vanderbilt). Hawes takes over the operation from Fowler and leads them to the Crowley house, where Deputy Elbert (Diane Ayala Goldner) and another Deputy are picked off by Crowley. Crowley ambushes the SWAT team and kills them all. Hawes tackles Crowley but is in turn pinned against the shed and has his spine torn out. While Rick catches Victor's attention, Deputy Schneiderman (Cody Blue Snider) takes the opportunity to fire a rocket launcher at Crowley, but misses and kills Rick, and blows up the Crowley house, destroying it, covering Victor in the rubble. When Schneiderman begins to celebrate, Victor appears from the wreckage and throws a piece of rubble into Schneiderman's back. He then proceeds to kills Schneiderman by ripping his arms off and drowning him in a puddle. Dougherty, Andrew and the Sheriff run for it. Before running, the Sheriff manages to slow Crowley down by shooting in the chest with a handgun.

Back at the station, upon hearing the SWAT team getting killed on the radio, Amanda convinces Deputy Winslow to let Marybeth out of jail and help her save everyone at Honey Island Swamp. She has Winslow take her and Marybeth to the house of Abbott McMullen (Sid Haig), Victor Crowley's racist long distant cousin and only living blood relative who possesses the ashes of Thomas Crowley. When he declines to give up the ashes, Amanda holds him at gunpoint and leaves with the ashes.

Back at Honey Island Swamp, the other paramedic is chased by Victor Crowley when he hides behind the canoe from the first movie. There, he finds Ben (Joel David Moore), who is still alive, lying in the canoe, clinging to life with his left arm ripped off. As he begs for help, Victor throws the hatchet at the paramedic, misses and hits Ben in the face, finally killing him. As Victor advances towards the paramedic, an alligator comes out of the swamp and pulls the paramedic into the swamp.

Victor resumes chasing the Sheriff, Andrew and Dougherty and corners them in the water ambulance. They barricade themselves in and the Sheriff calls for the National Guard on the ambulance's radio, telling them they're being attacked by crazed gunmen. The National Guard tells them they'll be there in ten minutes. Just as they settle down and think everything's all right, Victor begins to saw his way through the boat wall with the gas powered belt sander. The Sheriff tells them not to move, if they try to leave, they'll get killed, while Andrew thinks they should leave while he's busy cutting through the wall.

Amanda, Deputy Winslow and Marybeth arrive at the Swamp outside the burned down Crowley house. Amanda calls out for Victor, telling him they have his father. Upon hearing his wife's voice, Sheriff Fowler attempts to leave, only to be grabbed by Victor and beheaded with the belt sander. Andrew and Dougherty are trapped in the boat with Victor on the other side of the broken door. Dougherty attempts to slowly get the Sheriff's gun, but Victor grabs and pulls her through the hole on the door, which disembowels her. Andrew remains in the boat, keeping himself out of sight of Victor.

Victor goes back to his home, finding Marybeth, Amanda and Deputy Winslow there. Marybeth offers Victor his father's ashes and apologizes for what her father did to him. Victor proclaims "Daddy" upon seeing the ashes. When he tries to take the ashes, Deputy Winslow shoots Victor, but has his chest ripped apart by Victor. In response, Amanda attempts to take the urn from Marybeth, but is beheaded. Victor then knocks Marybeth over and impales her on a tree branch. Just when Victor was about to pick up a machete to finish Marybeth off, Marybeth smashes the urn over Victor's head, spreading his father's ashes all over him, and causing him to melt. With the last bit of her strength, she grabs one of the SWAT team's guns and blows Crowley away. The National Guard then arrives and Andrew emerges from the boat and signals the helicopters. Just as the screen cuts to black, one final shot of Marybeth gasping for air is shown, leaving her fate ambiguous.

After just one week of shooting this film, Kane Hodder declared it "the hardest job he's ever done". Performing rigorous action and stunts in sweltering Louisiana summer heat and humidity, while wearing thirty pounds of silicone and make-up on his body.
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Executive Producer and Writer Adam Green prides the Hatchet films on their "no CGI rule". All make-up effects are done the "old school" way, with prosthetics, make-up, latex, and silicone, in order to give the films their throwback feeling and tone. CGI and digital enhancement is only used for such things as wire removal, or fixing any camera issues that occurred while filming, but never to create the films' outrageous special effects. This movie was no exception to this rule, and Green continually challenged the make-up effects crew by writing crazy death scenes and sequences, that most any other modern production would have brought in computer generated visual effects teams to accomplish.
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According to the cast and crew's various tweets and social networking comments, the production for this film was a brutal one. Several crew members spent time in the emergency room, suffering from poisonous bug bites or D.E.E.T. poisoning (a chemical found in bug spray). Severe thunder storms, lightning, rain, heat, and humidity made the swamp location even tougher to shoot in. Production trucks and equipment were stuck under several feet of mud at times. At one point, Adam Green tweeted "I have forty-eight chigger bites from my waist down."
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Parry Shen has appeared in all three Hatchet films, but as different characters. In Hatchet (2006), he played Shawn, who worked for the Swamp Tours. In Hatchet II (2010), he played Justin, who was Shawn's brother. Justin also worked for the Swamp Tours. In this third film, he played a paramedic named Andrew. Andrew is not related to Shawn or Justin. A joke is even made in the film about how one of the bodies they find looks like him.
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The scripts given to cast and crew for production were each diligently watermarked with the crew member or performer's name and all distributed scripts were missing the film's last five pages. Only Adam Green and B.J. McDonnell knew what the ending would be while in production.
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Kane Hodder and Derek Mears played Jason Voorhees in different Friday the 13th/Jason films. Hodder played Jason in Friday the 13th Part VII: The New Blood (1988), Friday the 13th Part VIII: Jason Takes Manhattan (1989), Jason Goes to Hell: The Final Friday (1993), and Jason X (2001), and Mears in Friday the 13th (2009). This also marks the fourth time Kane Hodder was in a movie with someone who also played Jason. The first was in Friday the 13th Part VIII: Jason Takes Manhattan (1989), with future Jason, Ken Kirzinger. He also appeared in Hatchet (2006) and Hatchet II (2010) with John Carl Buechler.
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Rileah Vanderbilt (S.W.A.T. team member "Dougherty") appeared in the first two Hatchet films as "Young Victor Crowley", and also served as the key Make-up Artist on Hatchet (2006) and Hatchet II (2010). This movie marks her first character in the franchise using her own face.
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Writer and Executive Producer Adam Green (who not only wrote all three Hatchet films, but directed the first two of them as well) hand-picked his loyal Camera Operator, B.J. McDonnell to take his place in the director's chair on this film. A firm believer in giving someone who deserves it a chance, and a fan of helping jump start someone else's career (as seen with Green's discovery of newcomers Paul Solet and Grace (2009)) Green personally asked his fans to give B.J. a fair chance in a blog posting on the first day of principal photography. Citing the fact that B.J. had been with the franchise since day one, and reminding fans that Green himself was still responsible for the movie, and coming up with most everything that would happen in it, the fan response to McDonnell was very warm on the various horror and social networking sites.
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During a June 5th interview on ABC's "Good Morning New Orleans", Adam Green referred to this film as "the action packed conclusion". When asked what he meant by that, and prompted by the news anchor as to whether or not there would indeed be any more Hatchet films after this one, Green dodged the question by saying "evil never dies, and as long as there is still integrity in the films, and the fans still want more, I guess you never know." Sources close to Green and the movie production have used terminology in their various tweets and facebook postings alluding to the fact that Green wants to end the series with this third part, and will likely not personally be back for a fourth round. However, that changed with the release of Victor Crowley (2017).
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The combined total weight of all of the make-up appliances used to change Kane Hodder into "Victor Crowley" for this film, was an outrageous thirty pounds. It was crucial to Adam Green, if they were to make another Hatchet film, "Victor Crowley" look better than ever, while still using only prosthetic make-up, and never any CGI enhancement. The foam latex appliances from the first two films were thrown out, as this movie's make-up effects crew went to work creating new silicone appliances.
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This is the first of the Hatchet films to be filmed almost entirely in New Orleans, Louisiana. The first two Hatchet films were shot mostly in Los Angeles.
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If you watch all three "Hatchet" movies in a row without opening and end credits, it would be one uninterupted storyline, revolving around a few days.
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Cody Blue Snider (Deputy Schneiderman) started out as Adam Green's Personal Assistant during the making of Frozen (2010), and then worked as a Production Assistant on Hatchet II (2010), before Green wrote the role in this film specifically for him to perform.
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In each of the three Hatchet films someone says the line, "You've got to be fucking kidding me." In this film, it is Ben (Joel David Moore) again.
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Principal photography for this film was shot on location in New Orleans, Louisiana from May 30, 2012 through June 17, 2012. Additional photography was completed the next month in Los Angeles.
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Many of the characters in this movie are named after crew members from the original Hatchet (2006) film. S.W.A.T. team member "Mikaela Dougherty" is named after Adam Green's friend and Trick 'r Treat (2007) Director Michael Dougherty.
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Kane Hodder and Danielle Harris appeared on Fear Clinic (2009).
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This movie united two actors who previously played Jason Voorhees in the "Friday the 13th/Jason" film franchise, Kane Hodder and Derek Mears.
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Towards the end of the film, Joel David Moore (Ben from Hatchet (2006)) makes a cameo, and is abruptly killed again, with a hatchet to the head.
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This movie marks the second time a Kane Hodder character had a house fall on him only to survive. The first was in Friday the 13th Part VII: The New Blood (1988).
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Derek Mears' character is killed via his skull and spine being ripped out of his body. Mears previously worked on Predators (2010), where the Predators collect trophies of victims in a similar way.
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The US Coast Guard states that the air support had to come from Baton Rouge. There are 9 USCG bases in New Orleans and its surrounding areas, most are less then a 30 min drive from Honey Island Swamp including a major Naval air station, which also houses the USMC.
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When Sheriff Fowler calls the Coast Guard he says he is with the Jefferson Parish PD. They are known as the Jefferson Parish Sheriff's Department.
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