Undoubtedly, Xenomorphs are still one of the freakiest monsters ever to be released on big screens. The biomechanical design, the green acid blood, and a never-ending hunger for blood still give fans ...

Fans of the Predator franchise should check out these 15 other movies featuring alien threats, outer-space terror, and monstrous frights.

Since the first Alien movie premiered in 1979, audiences have been fascinated with the unstoppable killing machines known as the Xenomorphs. The sleek, black alien has appeared in movies, comic books, ...