''Prom Night III: The Last Kiss'' is 1990 horror comedy film.

This installment is a continuation of [[Film/HelloMaryLouPromNightII the previous film]]. It was released DirectToVideo as the previous film flopped theatrically, but performed well on home video.

Mary Lou manages to escape from the other side to the land of the living, and begins dating a student named Alex, offering her special brand of skills (read: murder) to help him through high school. But when he tries to break off with her due to all the bodies she leaves behind, all hell breaks loose (literally).

The film was written and co-directed by Ron Oliver, who had written the previous film and directed its reshoots. Peter Simpson, the producer of the previous two films, was the other co-director.

!!This film has the examples of:

%%* BlackComedy: And HOW!
%%* BoyMeetsGhoul
* ContinuitySnarl: Despite being a direct sequel to the previous film, there is absolutely no continuity with it whatsoever.
* DarkWorld: {{Hell}} is depicted as a darker and decaying version of the real world.
* DownerEnding: [[spoiler:Mary Lou kills Sarah, and traps Alex in the 50s. So once again, TheBadGuyWins]].
* {{Fingore}}: The RibbonCuttingCeremony for the Hamilton high's new school gym is ruined when the principal accidentally cuts off one of his fingers along with the ribbon.
* FireBreathingWeapon: After venturing into hell to retrieve her boyfriend, Sarah constructs a makeshift flamethrower to deter some of its denizens.
* HighVoltageDeath: Mary Lou kill Hamilton High's janitor with electrity, which causes his pacemaker to fly off from his chest.
-->'''Mary Lou:''' [[BondOneLiner Momma always said that I'd be a heartbreaker]].
* ImpaledPalm: Before killing Mr. Walker, Mary-Lou pins his hands on a table with ice cream cones.
* JerkJock: Andrew, who views Alex as a dweeb who has no place in Hamilton's football team, and tries to drive him away from it.
* LoveTriangle: Alex is dating both Sarah and Mary Lou.
* MsFanservice: Mary-Lou's appearances have her wearing all sorts of skimpy outfits.
* NumberedSequels: With TheLastTitle as the subtitle.
* PeekabooCorpse: After noticing his absence, Sarah goes to look for her prom date Leonard. She find him when his corpse suddenly falls from the ceiling.
* SlidingScaleOfComedyAndHorror: Contrasting with the other ''Prom Night'' films, ''The Last Kiss'' is a comedy horror film.
* {{Stripperific}}: Mary-Lou seems to enjoy conjuring up these outfits, appearing as a baker, [[NaughtyNurseOutfit nurse]] and [[FairCop cop]]. Averted with her football uniform, which is just the team uniform, bulky padding and all.
* StockFootage: Shots of Mary Lou's grave exploding are lifted from the previous film.
* ThisIsADrill: Mary Lou kills Andrew by tricking him to try to catch a football that turns into a drill mid-throw, which impales him.
* YourCheatingHeart: Alex has a girlfriend, Sarah, ''before'' he meets Mary-Lou. It doesn't stop him from sleeping with her. Repeatedly.