Hello Mary Lou: Prom Night II is a 1987 Canadian supernatural slasher film[5] directed by Bruce Pittman, written by Ron Oliver, and starring Michael Ironside, Wendy Lyon, Louis Ferreira, and Lisa Schrage.

In 1957, at a high school senior prom, student Billy Nordham discovers his date Mary Lou Maloney making out with another boy named Buddy Cooper.

Shortly after, the now-fully resurrected Mary Lou bursts out of Vicki's body, and uses her powers to wreak havoc on the prom, killing Kelly in the process.

She attempts to use the trunk that held her spirit to open a vortex to suck Craig into the underworld, but before she can, Billy arrives with her crown and finally gives it to Mary Lou, seemingly bringing an end to her murderous wrath.

[1] Producer Peter Simpson and The Samuel Goldwyn Company reshot half of the film before it completed production, with writer Ron Oliver directing the new scenes himself.

[8] Contemporaneous Kevin Thomas of the Los Angeles Times gave the film a positive review, praising Lyon's performance and drawing comparisons to Blue Velvet, adding: "You don't ... have to take Hello Mary Lou at all seriously, and it probably would be a mistake to do so.

Certainly, it's not on the deeply personal, highly idiosyncratic artistic level of the David Lynch film, but it is a splendid example of what imagination can do with formula genre material.

"[13] Vincent Canby of The New York Times described the film's extended "grand guignol" finale, writing: "Bruce Pittman, the director, and Ron Oliver, who wrote the screenplay, have constructed the movie as if it were a gourmet banquet for toddlers.

"[7] Bill Cosford from The Arizona Republic called it "a badly made film, as awkward as can be, and long stretches of it make no sense whatsoever.

"[14] Betsy Sherman of The Boston Globe deemed the film a "miserly slice-and-dicer: Carrie without the bucket of blood," though she conceded it is "somewhat livened by the presence of Michael Ironside.

"[15] The Philadelphia Daily News's Ben Yagoda panned the film, writing that it "can be credited with nothing other than providing temporary employment for a group of untalented individuals," and drawing comparisons between Peggy Sue Got Married (1986) and The Exorcist (1973).

[16] Richard Harrington of The Washington Post drew similar comparisons, writing that the film "may be derivative, but for the most part it's clever enough to trade on its sources with humor and class.

As vengeance-minded females go, Ms. Schrage makes Glenn Close in Fatal Attraction come off like a Girl Scout leader," adding that it serves as a "black-comic commentary on the whole notion of prom queens.

[22] In a retrospective assessment, film scholar and critic John Kenneth Muir wrote, "In the annals of unnecessary sequels, Hello Mary Lou: Prom Night II rates high.

"[25] Jacob Knight of ComingSoon.net similarly praised the film in a 2015 retrospective, writing: "It's a shame Hello Mary Lou never became a bigger hit, because it's an oft-forgotten gem of the horror genre, standing the test of time nearly thirty years on.

An amalgamation of national tax shelter weirdness, brazen borrowing from better films, and the tossing of creative caution to the wind, Pittman's picture evokes numerous classics while indubitably carving its own identity.