Not superheroes today.
So there's a lawsuit against Warner Brothers that's a little different. (Here's a brief YouTube video in summary.)
According to that link, Warner has to shore up its claim that the movies are based on "historical facts" by proving that witches and ghosts are real.
Wouldn't that be a great set-up for your PCs? And because time is short, they just have to go to the worst places. The studio stands to lose $900 million on this, so the budget for your players is &300 million (after salaries and lawyers).
And all they need is documented evidence...
(Did someone say, "Belasco Hell House?")