Jack was left a mute simpleton after a car accident. After being institutionalized for a year, Jack is released. As Halloween is approaching, Jack decides to carve a pumpkin, but the gourd had been taken over by an evil force and begins to bleed. Over the next four days, Jack lapses into occasional catatonic states, during which time the group of friends who had caused the earlier accident are murdered one-by-one by a deformed Jack O' Lantern creature.
Jack O'Lantern was almost universally panned by critics. DVD Talk wrote Jack O'Lantern is one of the goofiest, silliest, and most obviously inept "do-it-yourself" horror flicks I've seen in quite some time", offering that one might expect "a no-budget stinker like this populating the 99-cent VHS bin", but that it was "a bit bizarre to see a company like Lions Gate releasing this malformed mass on DVD." Of plot and cast they wrote, "The acting is hilariously bad, the story is muddled, familiar and boring, the kills are juicy yet infrequent, and the titular beastie? He looks like a goofy, runny, smelly pumpkin. Not too scary, obviously." They summarized by writing " is just a boring, derivative, and amateurish mess from beginning to end. When it's not ripping off better movies, it's meandering around in a barn and grinding to an endless halt." DVD Verdict also condemned the film, writing "Jack O'Lantern fails in almost every category it competes in. Acting, story, production values, gore, and entertainment, all of it—a big fat zilch-o." They expanded that the film's greatest flaw was in its execution and editing, with establishing shots, shot selections, script, plot, and acting also contributing to its failure and compared watching it to being "pruned by a blind toddler". In summarizing, they offered "this flick just isn't fun to watch. Your head will hurt listening to these idiots yammering on about some big secret and yawns will be suppressed during the big down-time between kills...which suck anyway". Dread Central compared watching the film to the personal devastation caused to the reviewer by Hurricane Katrina, writing "I watched a new direct-to-videohorror movie called Jack O'Lantern. I’d just like to take this opportunity to ask God a question: Have I not suffered enough?" The review pointed out the film's poor acting, script, filming, editing, and dialogue. They further wrote that the film is "Amateurish on every conceivable level, there is no justification I can think of for this wretched film to have gotten a legit release, certainly not through a name distributor like Lions Gate." Conversely, Film Monthly found the film "better than mediocre" and "highly watchable", but noted that this "watchability is tempered by horrible special effects work." It was offered that many of the film's flaws actually created unintentional laughs, and that "the plot somehow manages to be fantastically original and alarmingly derivative all at the same time." The reviewer summarized by writing "All in all, Jack O’Lantern will offer up the most original derivative plot with special effects cheap enough to be called direct-to-video. It’s not all that bad. It’s nothing great, but it’s certainly not all that bad."
