20 Horror Movies You'll Never Get To See

15. In the Mountains of Madness

Way back in 2010, Guillermo del Toro announced that he would be directing an adaptation of H. P. Lovecraft's cosmic horror novella At the Mountains of Madness, with James Cameron onboard to produce.

However, mere months later del Toro cast doubt on the film ever actually getting made, due to Hollywood's aversion to spending the necessary money on an R-rated period blockbuster with, in del Toro's words, "a tough ending and no love story."

By 2012 del Toro claimed that the release of Ridley Scott's similarly premised Prometheus further delayed the film's development, after which he went largely silent on At the Mountains of Madness for about a decade.

In 2021 he revealed that he was considering reimagining the project as a stop-motion animation, but while promoting his new Frankenstein adaptation last year, he admitted that the film would likely remain on his bucket list forevermore, calling it "too big, too crazy, too R-rated."

As incredible as this would be to see, between the big budget required and non-existent mainstream appeal, it's easy to see why no studio wants to stump up the moolah.