Movies and TvShows featuring "dark-setting" theme.

When an earthquake destroys their underwater research facility, a group of researchers must find a way to survive against the deadly creatures lurking in the depths of the ocean.

A group of friends go on a caving expedition in the Appalachian Mountains, but things take a dark turn when they become trapped and hunted by terrifying creatures in the caves. As they struggle to survive, tensions rise and secrets are revealed, leading to a fight for their lives.

In a filthy, cramped prison, some inmates must submit to injustices perpetrated by the head of the guards and his tormentors. Above them all, however, is the Judge, whom no one has ever seen: feared by both inmates and guards, he imposes the laws to be obeyed. The prisoners know the rules to follow but remember nothing of their lives; they know only the evil they have done to get there. Almost out of nowhere, a new prisoner joins the company: Princess. She is a beautiful woman, covered only by a fur coat of raven feathers...

A terminally ill patient, wakes up in a dark, decrepit underground chamber. An IV pumps an unknown liquid into his body and adorning his head is a crown of wires. His last memories lead him back to the hospital where doctors had recently discovered his illness. He didn't even have enough time to inform those closest to him of his untimely death sentence before ending up here. Behind the walls someone is lurking, and Ayden soon finds out that a psychotic killer, bent on performing strange, immoral medical experiments, is holding him captive. But there's more to this man than meets the eye, as Ayden will learn in time. What starts out as a sadistic medical experiment quickly becomes an excruciating race for Ayden to survive both his captor and his illness long enough to simply tell his shrouded family goodbye.

Lead character hears rats in the walls and goes to the basement to destroy them. But he opens a mysterious door with an ancient evil named Khastur.