|Directed by||Guy Magarmar|
|Produced by||Guy Magar
|Written by||Guy Magar
Marc B. Ray
|Music by||Pat Regan|
|Editing by||Patrick Gregson|
|Production company||Incorporated Television Company|
|Running time||110 mins.|
Stepfather III (also known as Stepfather III: Father's Day in home video releases) is a 1992 slasher film directed and written by Guy Magar and starring Robert Wightman and Priscilla Barnes. Stepfather III is the second sequel to 1987's The Stepfather and concerns the titular serial killer seeking out yet another all-American family to become a part of, using plastic surgery to disguise himself from the authorities.
Having survived the stab wounds he sustained at the end of the previous film, the stepfather (Robert Wightman), escapes from the institution in Puget Sound, Washington he was placed in four years ago, seeking a reclusive back alley plastic surgeon (Mario Roccuzzo) to perform extensive plastic surgery on him to alter his appearance, using no anesthesia. After taking several days to recover from the operation the stepfather kills the doctor by slitting his throat with a bone saw and makes his way to Deer View, California where has now acquired a new pseudonym, "Keith Grant", as well as a small cottage and a job at a plant nursery. Nine months after crafting his new life, Keith, during an Easter dance held by the church, meets and grows attracted to divorced school principal Christine Davis (Priscilla Barnes) who has a computer-savvy son named Andy (David Tom), who is a full-time wheelchair user due to psychosomatic ailments. Keith and Christine begin dating when Christine's possessive ex-boyfriend Mark Wraynal (Stephen Mendel) follows Keith home and claims he is going to marry Christine and that Keith should leave her alone. Feigning compliance at first, Keith murders Mark with a shovel and buries the body in his garden.
Despite Andy having some misgivings about Keith, his mother marries him, with Keith moving in with the two. Attempting to befriend Andy, who he believes he can help walk, Keith grows increasingly frustrated by the boy's introverted tendencies. When Andy's biological father Steve (Jay Acovone) offers Andy the chance to spend the summer with his family and attend a school for the gifted Andy decides to take his father up on the offer, despite Keith's protests. With Andy gone and Christine revealed to be infertile Keith begins courting Jennifer Ashley (Season Hubley), a widow who has moved into Keith's old cottage with her son Nicholas (Adam Ryen). Keith's plan to murder Christine and marry Jennifer grows complicated when Andy, suspicious that Keith is the escaped Family Serial Killer continually mentioned on the news, moves back to Deer View. Growing increasingly unstable after Christine and Jennifer meet and become friends, Keith murders his boss Mr. Thompson (Dennis Paladino) with a rake when he mentions that he spotted Keith cheating on Christine with Jennifer.
Convincing family friend Father Ernest Brennan (John Ingle) to help him uncover Keith's identity Andy invites the father over for dinner and the two sneak Keith's fork off the table, to have the fingerprints on it compared to the Family Serial Killer's. Realizing Father Brennan is up to something Keith excuses himself after dinner and follows the priest, running him off the road and killing him by beating his face against the steering wheel of his car. Making Father Brennan's death look like an accident by blowing up his car Keith attends his funeral (set on Father's Day) and afterward, when Christine mentions visiting Jennifer, rushes to the plant nursery and calls Jennifer, telling her to meet him. Before going to the nursery Jennifer calls Christine to cancel their meeting, claiming her new boyfriend called with an emergency. When Jennifer arrives Keith reveals he is married before claiming he needs her out of the way. Knocking Jennifer out Keith prepares to dump her in a wood chipper.
Arriving at the nursery with Andy in tow Christine, having pieced together that Keith is Jennifer's new boyfriend, confronts Keith about his affair and is beaten unconscious when she discovers Jennifer weakly writhing on the ground. As Keith prepares to murder his two lovers Andy, finding the fork he gave Father Brennan in the back of the car, finally realizes the truth about Keith and, overcoming his disorder, is chased through the nursery by his stepfather. When Keith climbs a ladder to look for him Andy knocks him off it and into the wood chipper and is almost dragged into it himself, only to be saved by Christine, who pulls him out of Keith's grasp. Despite Jennifer severing the power cable of the wood chipper Keith is still killed, being hacked to bits, finally ending him and his killing spree. The end shows the group walking out of the garden.
- Robert Wightman as The Stepfather/Keith Grant
- Priscilla Barnes as Christine Davis
- Season Hubley as Jennifer Ashley
- David Tom as Andy Davis
- John Ingle as Father Ernest Thomas Brennan
- Dennis Paladino as Mr. Thompson
- Stephen Mendel as Mark Wraynal
- Jay Acovone as Steve Davis
- Christa Miller as Beth Davis
- Mario Roccuzzo as Plastic Surgeon
- Joan Dareth as Bernice
- Jennifer Bassey as Doctor Brady
- Adam Ryen as Nicholas Ashley
- Mindy Ann Martin as Tiffany Davis
- Joel Carlson as Pete Davis
- Sumer Stamper as Maggie Davis
- Brenda Strong as Lauren Sutliffe
- Mort Lewis as Funeral Priest
- Adam Wylie as Easter Party Boy
To date the only DVD release of the film has been in Germany, where Marketing Films released it as a part of a limited edition box set containing the other two installments of the series in 2003.  It was also released in Germany separately. Elsewhere the only home video release of the film is on VHS. Lions Gate Home Entertainment has yet to announce any plans to release it on DVD.
Reviews of the film were varied, with Variety's Tony Scott stating "[The] film lurches on without much credibility" before going on to say "blood spurts, but director (and co-writer with Marc B. Ray) Guy Magar doesn't make the horror convincing. The simplistic story line and the unconvincing portrayal by Wightman haven't been enhanced by indifferent production values."  Entertainment Weekly's Doug Brod gave the film a D+, referring to it as "a poorly scripted, all-too-familiar chiller", also calling Robert Wightman "robotic" and "a weak substitute for previous death-dealing dad Terry O'Quinn". 
Time Out Film Guide stated that the film "is far better than one might expect" and called Wightman's performance "more barmy than ever" and "with that prissy, scary, whiny voice makes a good fist of it". 
- "Stepfather Part 1-3 - Complete Edition (3 DVDs Edition).". Amazon. Retrieved 2009-05-03.
- Scott, Tony (1992-06-04). "Stepfather III". Variety. Retrieved 2009-06-21.
- "Stepfather III: Father's Day". Entertainment Weekly. 1992-10-02. Retrieved 2009-06-21.
- "Stepfather III". Time Out. Retrieved 2009-06-23.