|Directed by||Boaz Davidson|
|Produced by||Yoram Globus
|Screenplay by||Marc Behm|
|Story by||Boaz Davidson|
Jon Van Ness
John Warner Williams
|Music by||Arlon Ober|
|Cinematography||Nicholas Josef von Sternberg|
|Edited by||Jon Koslowsky|
|Distributed by||Cannon Film Distributors|
|Running time||89 minutes|
In 1961, an unpopular boy named Harold leaves a Valentine's Day card at the home of Susan Jeremy. Susan and her friend David mock and crumple up the Valentine, prompting an enraged Harold to break into the house, and kill David by hanging him from a hatstand.
Nineteen years later, Susan is divorced, has a daughter, and a new boyfriend named Jack. On Valentine's Day, Susan has Jack take her to a hospital to pick up test results, and on the way into the building, she is observed from a window by a man in surgical garb. The man strokes a photograph of a young Susan, and sabotages the elevator Susan boards in order to delay her while he kills the doctor who has her paperwork, which the murderer tampers with. A janitor finds the doctor's body, and has his face dunked into a sink full of acid by the killer.
While looking for the doctor, Susan coerces a friendly intern named Harry into getting her results, which Harry notices are abnormal, prompting him to bring them and Susan to Doctor Saxon. The peculiarities of Susan's paperwork (which the murderer further sabotages after killing a pair of laboratory workers) cause Doctors Saxon and Beam to order that she be detained for observation. Harry uncovers evidence suggesting that someone is pulling a "con job" on Susan, but he disappears after promising Susan he will straighten things out. Jack, who had fallen asleep in his car while waiting for Susan, enters the hospital to look for her, and is lured to an empty room, where he is decapitated. The killer places a box containing Jack's head in Susan's room, then replaces it with a cake (identical to one seen in the intro) when Susan goes in search of aid.
After Susan tells him about Harry's findings, Saxon goes to look over the copies of her paperwork in the archives, where he is murdered with an hatchet, an act witnessed by Susan. Susan's claims of there being a killer on the loose are disbelieved, and she is strapped to a gurney after being deemed delirious. The staff prepare to perform emergency surgery on Susan, but are killed in rapid succession by the murderer, who takes Susan to a vacant operating room. Susan reveals the killer's identity as Harry, who is really Harold. When Susan asks what he wants, Harold responds, "What I've always wanted. Your heart".
Before Harold can cut her open, Susan stabs him with a scalpel, and escapes. Susan is pursued to the roof by the wounded Harold, who she sets on fire, and sends plummeting onto the street below. The next day, Susan is released, and reunites with her daughter and ex-husband outside of the hospital.
- Barbi Benton as Susan Jeremy
- Charles Lucia as Harold Rusk
- Jon Van Ness as Jack
- John Warner Williams as Doctor Dan Saxon
- Den Surles as Doctor Beam
- Gloria Jean Morrison as Nurse Dora Anders
- Karen Smith as Nurse Kitty Crandle
- Michael Frost as Ned
- Jimmy Stathis as Tom Jeremy
- Lanny Duncan as Hal
- Marian Beeler as Mrs. Edelman
- Elly Wold as Mrs. Fedrow
- Jonathon Moore as Mrs. Parry
- Gay Austin as Doctor A. Jacobs
- Bill Errigo as The Janitor
- Beverly Hart as Suzy
- Ann Charlotte Lindgren as Nancy Johnson
- Judith Baldwin as Desk Nurse
- Tammy Simpson as Eva Jeremy
- Elizabeth Hoy as Young Susan Jeremy
- Michael Romano as David
- Billy Jayne as Young Harold Rusk
- Don Grenough as The Doctor
Jeremy Wheeler of AllMovie said that the film had "zero plot", but was still "a bloody fun time". An overall score of 2½ out of 5 was awarded by Adam Tyner of DVD Talk, who wrote, "X-Ray is kind of dumb and ridiculous, sometimes deliberately and other times not so much. Even though there's basically no gore to speak of, plenty of the red stuff still gets sloshed around. The hospital backdrop opens itself up for some gleefully twisted and frequently medical-themed kills. I really love the score, and my ears are pretty certain those are actual strings and not the usual early-'80s banks of synths. Taken as a pure horror flick, it's a misfire: zero successful scares and not all that much in the way of suspense. As '80s slasher junk food, something I'll never turn down, it's worth watching once. And, yeah, once; not sure this is something I'll ever give a second spin".  DVD Verdict's Tom Becker stated, "While it's fun for a while, X-Ray runs out of steam long before the ending, in which the killer is unmasked, to the surprise of probably no one. An extended final chase also goes on way too long. While the oddness here can be a bit charming—including a bizarre bit that has three elderly women looking for a doctor in a closed-off part of the hospital—it's a few rungs down from must-see, even for fans of '80s slasher sleaze".  TV Guide succinctly concluded, "Unless you are a diehard Benton fan, this is a must to avoid". 
- Wheeler, Jeremy. "Hospital Massacre (1981)". allmovie.com. AllMovie. Retrieved 25 April 2014.
- Tyner, Adam (2 August 2013). "X-Ray/Schizoid (Blu-ray)". dvdtalk.com. DVD Talk. Retrieved 25 April 2014.
- Becker, Tom (31 July 2013). "X-Ray/Schizoid (Blu-ray)". dvdverdict.com. DVD Verdict. Retrieved 25 April 2014.
- "Hospital Massacre". movies.tvguide.com. TV Guide. Retrieved 25 April 2014.