Much as I love RyΕ«hei Kitamura's and Jeff Buhler's adaptation of Clive Barker's The Midnight Meat Train (2008), I really wish they'd had a scene with the Father of Fathers. Even just a glimpse.
According to Buhler, there were early discussions and concept art drafts to include the Father of Fathers but, ultimately, they were scrapped.
For me, this would have been the cherry on the top of an already excellent adaptation.
Here's Barker's description from his short story:
"Had there been sufficient light in that pit to see the whole, perhaps his tepid heart would have burst. As it was he felt it flutter in his chest as he saw what he saw. It was a giant. Without head or limb. Without a feature that was analogous to human, without an organ that made sense, or senses. If it was like anything, it was like a shoal of fish. A thousand snouts all moving in unison, budding, blossoming and withering rhythmically. It was iridescent, like mother of pearl, but it was sometimes deeper than any color Kaufman knew, or could put a name to."