As the anniversary of the harrowing events from A Nightmare on Elm Street 2: Freddy's Revenge draws near, Kristen Parker (Patricia Arquette) finds herself plagued by haunting nightmares featuring the notorious Freddy Krueger. Driven by a dark intent, Freddy manipulates a terrifying scenario that leads Kristen to appear as though she is taking her own life. Concerned for their daughter's wellbeing, Kristen's parents promptly admit her to Westin Hills Psychiatric Hospital, under the care of the attentive Dr. Neil Gordon.
Despite her predicament, Kristen initially battles against the rigid structure of the hospital, resisting efforts to sedate her as she desperately tries to remain awake. Her turmoil finds a glimmer of hope when Nancy Thompson (Heather Langenkamp), a newly appointed intern therapist, soothingly recites Freddy's infamous nursery rhyme. This comforting gesture allows Kristen to realize she is not alone in her anguish. As Nancy engages with the other patients, including Phillip (Bradley Gregg), a sleepwalker trapped in his own fantasies; Kincaid (Ken Sagoes), a resilient young man; Jennifer (Jennifer Rubin), an aspiring actress striving for success; Will, who struggles after a previous suicide attempt; Taryn, a recovering addict; and Joey (Rodney Eastman), who has become mute due to his traumatic past, the bond between Kristen and Nancy grows stronger.
However, their newfound companionship faces a harrowing trial as Freddy’s gruesome rampage begins anew. In a span of two nightmarish evenings, he claims Phillip and Jennifer as his prey, leaving the remaining patients in a state of paralyzing fear. Determined to seize control of their fates, Nancy reveals a chilling truth: they are "the last of the Elm Street kids," the few survivors of Freddy's violent past.
Their collective resolve leads them to explore shared hypnosis, embarking on a treacherous dream adventure that soon spirals into chaos as Freddy captures Joey, immobilizing him in the waking world—a chilling act that incites outrage among the hospital staff, leading to Nancy and Neil's suspension.
Amidst the turmoil, Dr. Gordon seeks counsel from Sister Mary Helena, a wise nun who unveils a tragic backstory: Freddy Krueger emerged as a consequence of a horrific ordeal endured by a young woman on the hospital staff—an incident that intertwines with the tortured history of Freddy's existence. Sister Mary Helena reveals the crucial task that lies ahead: to put Freddy's bones to rest permanently.
As their frantic search for answers unfolds, Neil and Nancy enlist the help of Officer Don Thompson—whose knowledge about the hidden bones proves invaluable. Meanwhile, a sense of urgency flourishes as Kristen is sedated at the hospital. With Nancy rushing to her side, Neil partners with Don to uncover Freddy's remains while the other patients attempt yet another hypnotic regression to connect with Kristen. Tragically, their efforts lead to further devastation: Taryn and Will fall victim to Freddy's spree, while Kristen, Nancy, and Kincaid orchestrate a daring rescue to save Joey. The stakes grow higher as Don's untimely death at Freddy's hands leaves Neil spiraling into despair, further heightening the nightmare.
In a haunting revelation, Nancy confronts the ghostly presence of Don, only to discover it is the clutches of Freddy himself exacting his final, brutal revenge against her. In an emotional climax, as Kristen cradles her dying friend, Neil successfully purifies Freddy’s bones, ultimately defeating the entity while sacrificing his own life force.
Later, at Nancy's funeral, Neil is stunned to find Amanda Krueger's gravestone, revealing her identity as Sister Mary Helena. As night descends, Neil lays down with the Malaysian doll gifted to him by Nancy, placed beside Kristen's creative papier-mâché house. Just as he becomes engulfed in slumber, ominous flickering lights emanate from Kristen's abode, signaling that Freddy's sinister presence lingers, plotting its next horrifying act.
