The film stars Jamie Lee Curtis, Andi Matichak, Rohan Campbell, Will Patton, Kyle Richards, and James Jude Courtney.

The plot follows the outcast Corey Cunningham who falls in love with Laurie Strode's granddaughter while a series of events, including crossing paths with Michael Myers, drives him to become a serial killer.

[8] On Halloween night in 2019, 21-year-old Corey Cunningham babysits a young boy named Jeremy Allen, who pulls a prank on him by locking him inside the attic.

After a struggle, Allyson, convinced of the truth behind Corey's death after receiving a call from Deputy Frank Hawkins, returns to help Laurie subdue and finally kill Michael by slicing his wrist.

Laurie and Allyson take Michael's body to the salvage yard by police escort, attracting the residents of Haddonfield, who follow them in a procession, and dispose of it in an industrial shredder.

Also appearing in the film are Jesse C. Boyd as Officer Doug Mulaney, Allyson's ex-boyfriend; Joanne Baron as Joan Cunningham, Corey's overbearing mother; Rick Moose as Ronald Prevo, Corey's stepfather who owns the salvage yard that Corey worked at; Michael Barbieri as Terry Tramer, leader of the gang of bullies who target Corey; Destiny Mone as Stacy, Joey Harris as Margo, and Marteen as Billy, members of Terry's gang; Michael O'Leary as Dr. Mathis,[11] Allyson's boss at the local hospital; Michele Dawson as Deb, Allyson's coworker who is having an affair with Dr. Mathis; Keraun Harris as Willy the Kid, a local radio DJ; Jaxon Goldberg as Jeremy Allen, a young boy who dies in a prank gone wrong while Corey is babysitting him; Candice Rose and Jack William Marshall as Theresa and Roger Allen, Jeremy's parents; Tony DeMil as Robert Tramer, Ben Tramer's son and Terry's abusive father; and Omar Dorsey as Sheriff Barker, Haddonfield's current sheriff.

[16] Green, McBride and Jeff Fradley had planned out a two-film story arc, but opted for a trilogy after realizing they had more material than originally thought.

[22] The writing team, consisting of Green, McBride, Bernier and Logan, started workshopping ideas before production of Halloween Kills commenced, completing a first draft in 2019.

[27] Benefitting from a character arc closely similar to that of Keith Gordon's Arnie Cunningham from Carpenter's Christine (1983), Corey was overall created to mimic how neglected community members can unexpectedly turn to evil.

[27] McBride liked Green's idea of focusing on Corey and considered his pitch a "smart take" because it would enable them to avoid a repetitive plot and explore something different as long as they tied that to the core themes of the Halloween franchise.

Initially, the character was not expected to return for the film, but following the positive reception to Richards's performance, the script was rewritten to give her an expanded role.

[28] Upon meeting with Campbell, Green "fell in love" with what they could do to Corey and it partly led him to change the original ending he envisioned for the character to not leave his fate open-ended.

[37] Campbell was one of the hundreds of actors who auditioned for Corey Cunningham, but Green and his assistant director chose him due to having a neutral "tough but sensitive" face, a neutral "handsomeness" and a look of having "life and emotion" plus his physicality, which later led Green to convince himself that Campbell could accurately portray Corey as a motorcycle rider instead of just acting like he knew due to his experiences, partially embodying the 1980s leather jacket bad boy.

[42][43] In an interview with Collider, Green hinted that co-writer Danny McBride had requested a cameo appearance in the film, potentially as a character who fights Myers.

[45][46] Following the release of the teaser trailer in July 2022, Omar Dorsey, Will Patton, and James Jude Courtney were revealed to reprise their roles from the previous films.

After several test screenings, the original final confrontation between Laurie Strode and Michael Myers as well as the ending sequence were discarded, and re-shoots for new scenes took place, four months ahead of the film's premiere.

It was decided that the film's conclusion should be more "modest" and "intimate" with some story points as opposed to a brawl like the "super noisy and aggressive" ending of Kills, with Green wishing to return the series to its "simple dramatic roots".

The premiere coincided with actress Jamie Lee Curtis's induction ceremony at the Hollywood Walk of Fame in front of the theater the following day.

The site's critics consensus reads: "Halloween Ends -- for now, anyway -- with a frequently befuddling installment that's stabbed, slashed, and beaten by a series of frustrating missed opportunities.

[91] Writing for Variety, Owen Gleiberman said the film is "neither scary nor fun" and called it "the most joylessly metaphorical and convoluted entry" of the franchise to date.

[92] Ben Travis of Empire gave a negative review, calling the film "lost up in its own abyss" and "an unsatisfying closing chapter" and criticizing Green's direction as "[struggling] to synthesise the serious stuff with the demands of a popcorn shocker".

[93] Multiple critics praised the opening sequence,[94][95][96] with USA Today's Brian Truitt calling it "an unnerving, unexpected scene that revels in a sense of parental dread right from the get-go",[97] and The Hollywood Reporter's David Rooney describing it as "an intriguing detour".

[96] O'Neal wrote, "Strange as it may sound, Halloween Ends contains echoes of Green’s name-making debut George Washington, another small-town tragedy that similarly spun out from the accidental death of a child.

The way Corey's bad reputation clouds his romance with Allyson, set up by a match-making Laurie, even recalls All the Real Girls in the film’s slow-burning opening stretch, during which Green seems content just to linger in his prairie gothic tale of grief and sublimated rage".

[102] Kyle Smith of The Wall Street Journal found Curtis's performance "a pleasure to watch" and called the film "largely gripping".

[104] In his review for The Hollywood Reporter, David Rooney called it "a sloppy movie whose principal new inspiration feels bogus", although "horror fans might enjoy homages to other films from the Carpenter canon".

[98] Giving 1.5 out of 4 stars, Brian Tallerico of RogerEbert.com found the film to be "poorly executed", rushed, and "barely a 'Halloween' movie" due to the story's focus on newly introduced characters, and considered Rohan Campbell's performance especially lacking.

[105] He concluded, "What's more likely true is that Green and his team had a truly ambitious film idea about the nature of evil and how violent loners can be created by fearful societies ... but they also had to make a 'Halloween' movie.

[18] Curtis had previously confirmed in an essay for People that Halloween Ends marked her last appearance in the franchise;[112] Jude Courtney likewise affirmed to Screen Rant that, alongside Curtis, he feels "done" with the franchise due to both his age and career trajectory, having felt Halloween and Kills as playoffs and Ends as a Super Bowl win so he decided to retire as the character triumphantly.

[113] Jason Blum reiterated that, while it would not necessarily be the final film in the franchise, it will be the last Halloween movie under Blumhouse Productions, with the intellectual property rights reverting to producer Malek Akkad following the release of Ends.