
After a thirteen‑year lull since the infamous “Lawnmower Killer” murdered her sister, high‑school student Mary Graves teams up with the obsessive detective Dick Harbinger to prevent the killer’s resurgence at the town’s annual Halloween Pumpkin Prom. The film follows their tense hunt, blending teenage drama with a chilling slasher premise.
Does Wacko have end credit scenes?
No!
Wacko does not have end credit scenes. You can leave when the credits roll.
See current US streaming, rental, and purchase options for Wacko (1982) via JustWatch.
Explore the complete cast of Wacko, including both lead and supporting actors. Learn who plays each character, discover their past roles and achievements, and find out what makes this ensemble cast stand out in the world of film and television.

Andrew Dice Clay
Tony Schlongini

George Kennedy
Mr. Doctor Graves

Charles Napier
Chief O'Hara

Julia Duffy
Mary Graves

Stella Stevens
Mrs. Doctor Graves

Helen Martin
Harbinger's Mother

Joe Don Baker
Dick Harbinger

Anthony James
Zeke

Ben Hartigan
Doctor

Jeff Altman
Harry Palms

Victor Brandt
Dr. Moreau

Christina Cummings
Prom Teacher

Darby Hinton
Rookie Cop

Sonny Carl Davis
Weirdo

Scott Norman
Avalon

E. G. Daily
Bambi

Greydon Clark
Lawnmower Killer

Joshua Daniel
Well-Dressed Student

Dan Frischman
Schlongini Singer

Steve Wagner
Orderly

John Avery
Danny

Janice Davies
Cafeteria Matron

Katina Garner
Woman in Massage Parlor

Scott McGinnis
Norman Bates

Toni Sawyer
Rosie's Mother

Pete Robinson
Harbinger's Brother

Fred D. Scott
Harbinger's Father

Erin Halligan
Gorgeous Young Girl

Alex Preissman
Girl At Prom

Lou Felder
Rosie's Father

Andrew J. Lederer
Schlongini Singer

Michele Tobin
Rosie

Tamar Howard
Little Mary

Michael Lee Gogin
Damien

Karole Selmon
Harbinger's Sister

Jacqulin Cole
Librarian

Michael R. Starita
Referee

Mickey Epps
Plainclothes Cop

Barbara Starita
Prom Chaperone

John E. Bristol
Driver's Education Teacher

David Drucker
The Looney

Wil Albert
Dr. Denton

Claudia Lonow
Pam Graves

Al Nalbandian
Dale

Laura Dashosh
Wandering Jew

Robert Magnus
Teacher

Joseph Jay Camen
Boy In Vice

Paula Jacquard
Girl At Prom

Shelley Doig
Girl At Prom

Larry Wills
Prom Teacher

Michael T. Starita
Boy With Nose

Ronald Kenney
Schlongini Singer

Suzie Harper
Lola

William Driver
Prom Chaperone

Edythe Magnus
Prom Chaperone

Stephen A. MaGinn
Prom Chaperon

Laurie B. McCormick
Prom Chaperone

John Roedel
Prom Chaperone

Mary Ann Roedel
Prom Chaperone

Donna Gaff
Nurse

James Gaff
Patient

Chris Cote
Avalon

Rick Neigher
Avalon

Simon Teolis
Avalon

Mike Mirage
Avalon

Eric Sundt
Swashbuckler
Discover where to watch Wacko online, including streaming platforms, rental options, and official sources. Compare reviews, ratings, and in-depth movie information across sites like IMDb, TMDb, Wikipedia or JustWatch.
Read the complete plot summary of Wacko, including all major events, twists, and the full ending explained in detail. Explore key characters, themes, hidden meanings, and everything you need to understand the story from beginning to end.
Dick Harbinger is a police officer. Thirteen years ago, on Halloween, a pumpkin-headed figure driving a lawnmower murdered several children, turning the town’s memories into a deep, lingering fear. Everyone is a suspect in the case. The school janitor, Zeke, is brought in for questioning, while the father of the Graves family also becomes a civilian target of police scrutiny. His daughter, Mary Graves, has caught him peeking at her on multiple occasions, whether in the shower or as she slept. Mary’s friend Rosie is dating Tony Schlongini, a young man whose life and circle were torn apart by the pumpkin-headed menace. The killer, known to the town as the Lawnmower Killer, claimed Tony and many others, leaving a trail of fear that refuses to fade.
As the old wound festered, the investigation stumbles along with a troubling sense that the authorities aren’t treating the threat with the seriousness it deserves. Thirteen years after prom night, the pumpkin-headed killer seems poised to return, threatening once more to turn Halloween into a blood-red ritual. A determined detective recognizes that time is running out and chooses to act even when the system won’t. In a drastic move born of desperation and resolve, he disguises himself as the Lawnmower Killer to force a confrontation and compel real action.
Mary has carried the trauma of that long-ago tragedy—from horror and sexual tension to the grueling work of psychoanalysis—and she still feels the shadow of lawnmowers in her life. The narrative follows her struggle to navigate fear, memory, and a present that keeps echoing the past, even as she tries to hold on to some sense of normalcy.
Meanwhile, the Harbinger household drifts between moments of routine and creeping dread. At the dinner table, the family attempts to pretend everything is fine, even as the danger outside grows more palpable. The killer’s plot thickens, and the detective’s relentless pursuit pushes toward a confrontation that could finally expose the truth behind the Halloween nightmare. In one chilling detail, the story notes a scene where a suitcase with a built-in tap carried a coffee load, signaling the methodical, almost ritualistic nature of the threat. The suspense tightens as the Lawnmower Killer resurfaces, threatening to erase the fragile lines between history and the present.
The clash between past trauma and present danger reaches a fever pitch as the town braces for a possible remake of the horror that once shattered it. The obsessive pursuit, the hidden routines, and the fragile bonds of family pull the characters toward a moment of reckoning, where fear and duty collide and the only certainty is that some Halloween nightmares refuse to stay buried.

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