The Super Mario Bros film ended on a cliff hanger…
What happened, and what if any were the plans for a sequel?
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In 1993 Lightmotive Pictures released Super Mario Bros. The Movie, a live-action adaptation of the popular video game series. The film ended with a sequel hook which went unexplored — until now.
Following discussions with original writer Parker Bennett, Steven Applebaum and Ryan Hoss have scripted a new adventure that continues right where the film left off. Join Mario, Luigi and Princess Daisy as they explore new locations and creatures inspired by the games, yet adapted in the film’s unique cyberpunk style.
According to their FAQ page, it picks up the film’s storyline, is based on what would have happened in a sequel, and thus can be considered canon:
Is it canon?
Yes! Steven and Ryan worked with original writer Parker Bennett on outlining the project. Parker discussed in detail the backstory for the parallel world as well as possible ideas for the unproduced sequel, resulting in a groundwork for our team to script a new story. This adventure is as close to what would have made it on film.
I haven’t read the comic, so I can’t tell you what happens, nor have I found an interview with the original Parker Bennett confirming its canonicity, but it seems legit.