The Xenomorph

Where it comes from

The xenomorph began as an idea on a page. Screenwriter Dan O'Bannon wrote the first draft of what became Alien with Ronald Shusett, who is credited with the notion of a creature bursting out of a human chest, reportedly after a dream. O'Bannon had earlier worked on Alejandro Jodorowsky's unmade adaptation of Dune, where he met the paintings of the Swiss artist H. R. Giger. When the monster needed a face, he knew whose work to ask for.

The word itself comes later and from inside the story. In the 1986 sequel a character uses xenomorph as a general term for alien life, meaning roughly “strange form,” and fans began applying it to this one species. The first film never used the name, and the creature is simply the alien.

On screen

In Alien the creature is shown in stages and almost never in full light: an egg, a clinging parasite, a small thing that tears out of a body, and finally a tall black adult that seems to be part of the ship around it. The film withholds the whole shape until late, so the audience builds the monster in its own head.

Later entries in the Alien franchise multiplied it. Aliens (1986) turned it into a swarm and added a queen; Alien 3 (1992) gave it a four-legged gait; Alien Resurrection (1997) brought a human-alien hybrid; two crossover films with the Predator series followed in 2004 and 2007; and Alien: Romulus (2024) added a new stage to the life cycle.

Common traits

• A life cycle of egg, facehugger, chestburster and adult, with castes ruled by a queen in the sequels.
• Acidic blood that can eat through metal, which makes killing it dangerous in a spacecraft.
• A body that blends bone-like ridges with pipes and tubes, drawn from Giger's biomechanical style.
• An inner set of jaws on an extendable mouth, the detail that most viewers remember.
• No eyes in the original design, which makes it harder for victims to read where it is looking.

From Necronom IV to the screen

Director Ridley Scott saw Giger's work and recognized what the film needed. He chose a 1976 painting, Necronom IV, as the starting point for the adult creature. Giger had offered to design the whole thing from scratch, but Scott preferred to begin with an image that already existed. The painting shows a long-skulled, tube-ribbed figure that looks grown rather than built, and its mix of bone, machinery and sexual suggestion became the creature's identity.

Giger sculpted a full-size mock-up using found materials. Accounts describe parts of an old Rolls-Royce, rib bones and snake vertebrae, all of which fed the unsettling sense that machine and skeleton had merged. He gave the head no eyes. He also added a second set of jaws that shoots out from the first, an idea that gave the monster its most memorable gesture. He also contributed to the planet's terrain, the derelict ship and the eggs, so that the creature looks like it belongs to the places it inhabits. Production designers Ron Cobb and Chris Foss handled the human ship and its sets, while John Mollo designed the costumes, which is why the film seems to contain two separate worlds, one industrial and one organic.

Building the suit and the head

The adult alien was played in most scenes by Bolaji Badejo, a graphic designer who was about six feet ten inches tall and extremely thin. A latex costume was molded to his frame. To make his movements feel less human, he studied tai chi and mime. Scott's shots tend to catch only part of the body at once: a hand, a tail, a section of dome, the glint of a jaw. Badejo's height and slow, deliberate pose let the camera suggest a figure that is taller and longer than any actor.

The animatronic head was made by the Italian effects artist Carlo Rambaldi and is reported to have around 900 moving parts, including the inner jaw mechanism. Rambaldi and Giger were among the winners of the Academy Award for Best Visual Effects for the 1979 film, presented in 1980. Other pieces of the creature were built from humble things. Producers and crew accounts say the facehugger had a tail made from animal intestine and the egg held a slurry of animal innards that Scott agitated by hand from below, because real wet matter moves in ways that rubber does not.

A creature with a life cycle

What makes the xenomorph unusual among film monsters is that it is a process and not a single body. The egg stays dormant and opens when something approaches. A facehugger attaches to a host's face, paralyzes it and implants an embryo. The chestburster grows inside and emerges, taking on some traits of its host. The adult then hunts. In the sequels, the species gains a queen that lays eggs and a society of drones and warriors, which reads as a hive in the manner of ants or wasps.

The pattern resembles real parasites that develop inside living hosts, which many viewers know from nature programs, though the film never says so. The effect is to make the creature feel less like a demon and more like biology. It does not hate anyone. It is simply a reproductive cycle that treats people as shelter and food. That impersonal quality is part of why it still frightens audiences who have seen it parodied countless times.

Reinvented for each sequel

James Cameron's Aliens (1986) was released on July 18 of that year and cost a reported $18.5 million. Giger was not involved in the sequel. Stan Winston's studio built the queen as a puppet about fourteen feet tall, operated by several people at once, with two inside the body working the arms and others moving the head and tail. Cameron wanted something huge, quick and unmistakably female, which he described as hideous and beautiful at once. Only a dozen alien suits were made, and dancers and stuntmen wore them. Cameron kept faithful to Giger's look while extending the arms of the warriors, and Winston gave the chestburster arms.

Alien 3 (1992) brought in a four-legged, doglike creature, and Giger prepared designs for it, though he later felt his contribution was reduced. Alien Resurrection (1997), directed by Jean-Pierre Jeunet, introduced a hybrid called the Newborn. The Alien vs. Predator films (2004) and Requiem (2007) produced the Predalien. Prometheus (2012) and Alien: Covenant (2017) went to the beginnings of the species, introducing related creatures instead. Alien: Romulus (2024) added a cocoon stage between the chestburster and the adult.

What the creature means

Critics have argued about the xenomorph for decades because it invites so many readings. Barbara Creed, in her work on the monstrous-feminine, treated it as an example of the archaic mother and saw in its mouth the old fear of a devouring womb. Thomas Doherty described it as a cross-dressing monster from the id, a creature whose gender cues are confused on purpose. Ximena Gallardo called the design a nightmare vision of sex and death, and Amanda DiGioia has argued that the toothed imagery reflects learned male anxieties, not anything inherent in the body.

Others read the film as a story about work and corporations: a commercial crew, a company that values the specimen over its people, and a ship so industrial that the monster looks like it grew from its walls. The imagery of forced impregnation, with men as hosts, upends the usual direction of horror. Giger's art makes the sexual reading hard to dodge, but the film does not explain itself, and each decade finds different fears in the shape.

Reception and the long afterlife

Alien opened at the Seattle International Film Festival on May 24, 1979, and went into wide U.S. release on June 22. Reviews were mixed at first, but the film earned about $78.9 million in the United States in its first run, with worldwide estimates running far higher. Later critics treated it as a landmark, and the Library of Congress added it to the National Film Registry in 2002.

The creature's silhouette is now part of the shared visual language of science fiction and horror. It shaped the way later films designed their monsters, from the parasites of body horror to video game enemies, and Giger's biomechanical style became a mark of the 1980s and 1990s. His influence extended to other screen creatures too, including the designs he made for Species in 1995. He died in 2014, and his museum in Gruyères, in a castle he acquired in 1998, continues to show his work.

Where to go next in the library

A good order is to start with Alien itself and then read about the Alien franchise to see how directors with different tastes treated the same animal. For the heroine who faces it, see Ellen Ripley. For the genre context, read about the Creature Feature and Body Horror, where the xenomorph's parasitic cycle has many relatives. The Fly is a useful companion piece, since it also fears what happens inside a changing body, and David Cronenberg explored that territory in his own way.

Verified details

• H. R. Giger was born in Chur, Switzerland, in 1940 and died in 2014.
• Ridley Scott picked Giger's 1976 painting Necronom IV as the basis for the adult creature.
• Carlo Rambaldi's animatronic head is reported to have had about 900 moving parts.
• Bolaji Badejo, who wore the suit, was about six feet ten inches tall and took tai chi and mime classes to slow his movements.
• Giger and Rambaldi were among those who won the Oscar for Best Visual Effects for Alien at the 1980 ceremony.
• Dan O'Bannon wanted Giger's foam-rubber sculpture left unpainted, because it resembled human skin.
• The facehugger's tail was made from animal intestine, with air blown through it to make it whip.
• The queen in Aliens was a puppet about fourteen feet tall built by Stan Winston's studio.
• Only twelve alien suits were made for Aliens.
• Alien was added to the National Film Registry in 2002.

Sources and further reading

• Xenomorph, Wikipedia
• Alien (film), Wikipedia
• H. R. Giger, Wikipedia
• Aliens (film), Wikipedia
• Alien's Facehugger Props, SlashFilm