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Mary Lou, the prom queen burned to death by her boyfriend back in the fifties, has escaped from hell and is once again walking the hallways of Hamilton High School, looking for blood. She chooses as her escort in world of the living Alex, an average depressed student with dreams of one day becoming a doctor. As Mary Lou begins to get back into form, the body count starts climbing and the graduating class of Hamilton High is once again smaller than expected.

How to Watch Prom Night III: The Last Kiss Legally and Safely

If you want to stream Prom Night III: The Last Kiss through reputable and legal services, there are a few good options depending on where you are. Subscription platforms like HBO Max, Disney+, Netflix, Amazon Prime Video, and Apple TV+ sometimes carry Prom Night III: The Last Kiss films or related DC titles—though availability depends on your country.

If you’d rather not commit to a subscription, there are ad‑supported, free (but legal) platforms such as Tubi, Pluto TV, Peacock or Crackle (where available in your region) that occasionally host superhero films.

Lastly, don’t forget about library‑linked streaming options like Kanopy or Hoopla (if your library or university is registered), and official uploads by film distributors on YouTube—these can also give you legal access to classic movies.