The Dark Tower
A small portal is open into an alternate universe, but we are only allowed to peek at it from afar. Not even worth for those who read the books, I would wager.
That universe is actually a series of parallel universes, of which our Keystone Earth is only one of them. MidWorld is a post apocalyptic wasteland, left characterised over generic ““-like.
Our hero, Roland, is from a lineage of Gunslingers descended from King Arthur who uses two revolvers forged from the metal of Excalibur. At least that’s the gist of it, it could have been more explored.
Ultimately, it feels like a trailer for a future television series, more than a fully-fledged film.