"This list will discuss a number of great monster movies that are often being left out of the discussion, but before we do that it's important to define some restrictions of what is and what is not a monster. Monsters are often described as beings without a moral compass, so in this case you could call Halloween's Michael Myers a monster, but for this list we're not looking at the human monster, we're looking at creature features here. We'll restrict our monsters to the otherworldly, the mutated, the supernatural, the animalistic… We're looking at the monsters similar to the ones from the German Expressionist period and the Universal classics. In these films it's the collective humans against the monster(s)!
One last thing to mention, since there are so many options with these creatures; this list restricts itself to horror movies, while the monster genre does not. (Think A Monster Calls for example…)."