Freddy vs Jason vs Ash would have been truly epic, IMO. But I heard that Campbell didn't want to have a 'tie' with the two killers, so they scrapped the project.
That said, I would have loved to have seen Peter Jackson's proposed Nightmare on Elm Street film where Freddy was the good guy, Tim Burton's third Batman film which would have starred Robin Williams as the Riddler, and the version of Howard the Duck where the duck would have been an animated character and the script wasn't so dumbed down.
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"You, me, everyone...we are all made of star stuff." - Neil Degrasse Tyson
https://shawnsmovienight.blogspot.com/
"You, me, everyone...we are all made of star stuff." - Neil Degrasse Tyson
https://shawnsmovienight.blogspot.com/