The Alien franchise features the Xenomorph, one of the most iconic and terrifying monsters in history. The creature first appears in the 1979 movie Alien, with a design credited to H.R. Giger and his painting Necronom IV, and it has evolved from there. Giger then joined the movie team and brought the Xenomorph to life, designing the adult and egg, and the rest is horror movie history.
While the Xenomorph is the gold standard for movie monsters, there are several movie monsters that are even scarier than the Alien creatures. The Xenomorph is a perfect organism with acid blood and a life cycle that creates nightmares, but that is not only original to this one specific monster. There are creatures in other movies that are frightening for various other reasons, whether that is weaponizing a human instinct, punishing trust, or even punishing people for looking at it.
While the Xenomorph is basically human-sized, Clover is a giant kaiju, and Jean Jacket is a 250-foot-wide alien creature. Others can change shape and resemble anyone, which raises fears that monsters live among the population. Each of these monsters offers up scares, and many of the terrors are greater than even the monster that promises that no one can hear screams in space.
Jean Jacket – Nope (2022)
Jordan Peele has mastered the idea of terror in real-life places. In Get Out, he presents horrors in a suburban community. In Us, he takes a family unit and throws them into a terrible situation. In Nope, he goes to a small desert community and introduces a monster scarier than even those wealthy suburbanites and doppelgangers from his previous films. This monster, nicknamed Jean Jacket, is a living predatory creature that lives in the sky.
From the outside looking in, Jean Jacket seems to be a flying saucer or a UFO. However, that is only what this terrifying monster pretends to be. Its true form unfurls at the Nope climax into a vast jellyfish-like being with ribbon-like tendrils, reminiscent of something from an H.P. Lovecraft story. It attacks anyone who looks at it and consumes its prey whole, hunting in an open sky where there is no hiding. Its immense width of 250 feet makes it seem almost inescapable.
Calvin – Life (2017)
Directed by Daniel Espinosa and written by Rhett Reese and Paul Wernick, Life features a Martian organism recovered in a soil sample by an ISS crew. Some school kids nicknamed the alien “Calvin,” which makes it seem almost like a pet at first. However, this is what makes it so scary when its true nature is revealed. The name makes it seem almost innocuous.
However, the theory is that Calvin is the life form that wiped out all life on Mars so long ago, and it turns out to be a planet-killer being brought back to Earth. It is also seemingly indestructible, with no separate organs or vulnerabilities. It also gets smarter as it kills and feeds, eventually learning to use weapons and tools. The Xenomorphs can die, but Calvin seems unkillable, and it reaches Earth in one of the bleakest sci-fi movie endings in years.
The Kaiju – Pacific Rim (2013)
Pacific Rim is a movie by Guillermo del Toro that generated considerable excitement upon its release, promising giant mech robots fighting giant kaiju. That is what it delivered, and while the giant robots were an interesting invention, it was the kaiju that were the real selling point of the movie. They are giant monsters that emerge from a dimensional rift called the Breach, which is more than five miles below the Pacific surface.
The Pacific Rim kaiju are so dangerous that humanity had to create the giant mech robots to have a chance against them. These kaiju are bioengineered weapons created and controlled by an alien race, the Precursors, who inhabit a parallel universe called the Anteverse and intend to colonize Earth. Their blue blood destroys land, so even their deaths are destructive events, and their only existence is mass contamination and destruction.
Clover – Cloverfield (2008)
In 2008, Matt Reeves directed one of the best found-footage horror movies of all time with Cloverfield. This is another kaiju movie, but this one has a twist. The kaiju is mostly seen from a distance, except for a big scene toward the end. The other scary thing is that Clover is only a baby, and a full-sized version would dwarf this one and create mass devastation for any city in its path. Despite being a baby, it is still between 240 and 300 feet tall.
Clover is also a tragic monster, as it is a terrified baby with severe separation anxiety, lost on an alien world and lashing out while searching for its mother. Even more terrifying, its body is covered in dog-sized parasites that it sheds as a post-birth ritual. Their bites are lethally infectious to humans, creating a second wave of horror. Its colossal size makes it effectively unkillable by conventional weapons, and it destroys an entire city rather than picking off a small crew.
The Mist Creatures – The Mist (2007)
The Mist is based on a Stephen King novella and is directed by Frank Darabont, who previously directed The Shawshank Redemption and The Green Mile. Unlike those latter two movies, The Mist is a pure horror tale, and it remains notorious for the fact that Darabont changed King’s ending to be even darker and more nihilistic than in the story. The story takes place during a thick mist that rolls into town, and from it, monsters emerge.
The creatures pour into the world through an interdimensional portal opened by a secret military experiment. They are a whole alien ecosystem, not a single monster, featuring multiple distinct species of varying size and lethality. The concealing mist reduces visibility to near zero, so victims cannot see what is hunting them until it strikes. Unlike the Xenomorph, it is not one monster but a legion of predators.
Yautja – Predator (1987)
The Yautja shares a strong connection with the Xenomorphs because both monsters exist in the same fictional universe. In fact, there were two movies where these horror creatures fought each other. While the Xenomorphs have been in more quality movies than the Yautja, the Predator franchise has seen a resurgence in recent years and might be the better monster movie franchise now. Regardless, it is still the apex predator of the two.
The Yautja first appeared in Predator, directed by John McTiernan. It is a technologically advanced warrior species that hunts dangerous prey for sport. However, unlike the relentless Xenomorphs, the Yautja has a moral code and will only hunt those it deems a good sport who can defend themselves. Even so, it is scarier than the Xenomorph because the best Yautja is an intelligent, tactical hunter, using the best in advanced technology and weaponry.
The Death Angels – A Quiet Place (2018)
The Death Angels made their debut in the 2018 movie A Quiet Place. John Krasinski’s film never names the creatures on screen, but “Death Angels” remains the most common nickname. They arrived on Earth after their own planet was destroyed and began hunting down and killing humans, claiming the planet as their own. They are completely blind and hunt entirely by sound, attacking anything that makes the slightest noise, which forces the survivors into total silence.
Their hearing is extraordinary, and they move at blazingly fast speeds. Near-impenetrable skin leaves one opening, which is the flesh under their head armor. High-pitched sound forces that armor open, while water masks noise well enough to blunt their hunting entirely. They are very similar to Xenomorphs, but with their speed and hunting skills, they remain the deadlier monster.
The Crawlers – The Descent (2005)
The Crawlers in The Descent remain some of the most terrifying movie creature creations of the 21st century. The film follows six women trapped by a cave-in during a spelunking expedition who find the caves inhabited. The scariest thing here is that the Crawlers are not aliens. They are an offshoot of humanity, trapped underground for thousands of years and evolved into a primal, cave-adapted species.
They are completely blind, with milky, useless eyes, and hunt by acute hearing and smell. They are fast, feral, and lethal, using the pitch-black caves they navigate perfectly to ambush prey. These are rarely seen in the movie, and when they do enter a lit area of the caves, they are utterly terrifying. There is no escape in the claustrophobic tunnels, and the horror that they are degenerated humans rather than distant aliens makes them uniquely disturbing.
Pennywise – It (2017)
Pennywise is scarier before he shows his true form. That is because Pennywise is a dancing clown and one of the scariest horror creations in cinema. He is played in the original television miniseries by Tim Curry and then even more creepily in the two Andy Muschietti movies by Bill Skarsgård. While Pennywise is terrifying as a clown with a giant mouth full of sharp teeth, he is actually an alien who can change shape.
He has also taken the form of a giant spider, because his true form is not physical but the Deadlights, which could drive anyone who looks at them permanently insane. He also feeds on children, which makes him even more terrifying. His powers include shapeshifting into each victim’s deepest fear, making the threat psychological rather than purely physical, as is the case with the Xenomorph.
The Thing – The Thing (1982)
In 1982, John Carpenter directed the horror remake of The Thing from Another World, but by basing it on the source story, Who Goes There?, it was very different from the previous movie and surpassed it on almost every level. While a box-office and critical flop upon release, it has since been elevated to one of the best horror movies ever made, and for good reason. The alien transforming into any person it kills is a terrifying proposition.
The monster here could be anyone, no matter how trustworthy, and it played well on the Cold War fears of its era. However, it remains a solid horror masterpiece to this day, and the special effects when the creature shows its true face are horrifying. It is effectively unkillable since any surviving fragment regenerates, and its goal is to silently replace and assimilate all life, threatening the whole planet if it reaches civilization.