The Aliens were a group of unnamed creatures that acted as the central antagonists of the 1993 sci-fi horror film Fire in the Sky, which itself was based loosely on a real-world UFO abduction case from the 1970s.
History
The aliens are an unnamed humanoid species depicted as hairless, tall beings similar to the Greys but have a more human-like flesh tone as well as less pronounced eyes, their faces lack ears or noses but do have a fairly human-like mouth, later in the film it is shown the aliens have spacesuits which resemble more closely the traditional Grey aliens humans have encountered in popular culture.
For unknown reasons the aliens were engaged in a long-running project of brutal experimentation on sapient creatures, including humans, abducting victims and subjecting them to bizarre medical experiments and indeed unlike traditional abduction cases there was evidence many of these experiments turned fatal, with the cocooned remains of mutilated human corpses being found around the ship's corridor.
These murderous aliens would abduct a hapless human and subject him to an infamously torturous experiment in which a probe was inserted into his eye, yet despite the brutality of the experiment and his attempts to flee the abductors (in the process discovering many of the things discussed above) the aliens would choose to send him back to Earth alive, albeit naked, mutilated and mentally scarred.