A Fly in the Ointment: Body Horror and the Fear of Becoming Other in The Fly

Our bodies shape how we experience the world, express our identities, and connect with others. We develop expectations about our bodies and what they make possible, often without realizing it. But what happens when those expectations are disrupted? When our bodies change in ways we cannot control, or when the relationship we have with our bodies shifts in ways we did not anticipate?

David Cronenberg’s The Fly (1986) turns these questions into a spectacle of body horror. When scientist Seth Brundle (Jeff Goldblum) accidentally merges his DNA with that of a housefly during a teleportation experiment, his body begins a horrifying transformation. What initially appears to be a physical enhancement gradually becomes an irreversible deterioration, threatening his identity, relationships, and future.

Like much of body horror, The Fly draws on fears about illness, disability, and mortality, forcing the viewer to confront our mortal vulnerability. Its grotesque imagery refuses to let us look away from the reality that our bodies can change, deteriorate, and become sources of suffering in ways we cannot control. For some, these realities may be especially difficult to accept, challenging the sense of permanence and autonomy through which we understand ourselves and our lives. But the film also invites us to examine what we do with that discomfort: how our anxieties about bodily vulnerability shape our assumptions about illness, disability, and what makes a life worth living.

When the Body Betrays Us

Initially, Seth seems to have achieved the impossible. His experiment makes him stronger, faster, and more physically capable, embodying a fantasy of bodily mastery in which science can overcome our physical limitations. But as his transformation progresses, his sense of control unravels.

His girlfriend, Ronnie (Geena Davis), notices the changes before he does. Seth insists that nothing is wrong even as his behavior and appearance become increasingly abnormal. When his laboratory results confirm that something has gone awry, the possible consequences of his teleportation become a more concrete threat, but the implications remain unclear. The bathroom scene marks a turning point: confronted with his deteriorating face, Seth can no longer maintain his denial. When he pulls off a fingernail, the horror becomes visceral. What was once an uncertain threat is now unfolding before his eyes. His body is not invulnerable after all.

The gap between knowing something is wrong and understanding what it means can be profoundly unsettling. An abnormal test result may identify a problem without yet showing how it will manifest in lived experience: what symptoms may emerge, how functioning may change, or what the future may hold. The Fly draws horror from both the initial discovery of an unexplained abnormality and the subsequent emergence of symptoms that make its implications impossible to ignore. Each new change begs the question, how far will this progress, and what, ultimately, will become of him?

Becoming Other

Seth initially describes his condition as a “bizarre form of cancer,” mocking the imagined future of a patient endlessly discussing symptoms and bodily losses as a “tumorous bore.” To him, illness threatens to reduce a person he knows as complex and capable to a collection of symptoms. 

But as his own symptoms multiply, Seth quickly finds himself inhabiting the very future he once dismissed. As his body changes, so does his relationship with the world. Increasingly ashamed of his appearance and consumed by his symptoms, he withdraws from others. His fear extends beyond being sick to the possibility that Ronnie will see him differently, and perhaps stop recognizing him altogether.

As his transformation progresses, Seth attempts to make sense of his changing body by intellectualizing his losses as “historical artifacts,” remnants of his former self. When he discovers that his genes have been spliced with those of the fly, he gives his hybrid identity a name: “Brundlefly.” By categorizing, explaining, and naming his transformation, Seth tries to make an unpredictable process more comprehensible. Yet understanding what is happening to his body does not mean he can control it, or that he can reconcile himself to what it means for his sense of self.

The fly itself is significant: an ordinary, ubiquitous creature associated with contamination, decay, and intrusion. It enters Seth’s life just as he achieves the scientific breakthrough that could define his career. Despite his intelligence and ambition, he is no more immune to a random accident than anyone else. Like illness itself, the fly arrives without regard for merit, virtue, or readiness, disrupting the illusion that achievement or good fortune can protect us from bodily vulnerability.

The Social Costs of Being Othered

As Seth struggles to make sense of his changing body, his transformation also reshapes how others see and relate to him. Increasingly isolated, he warns Ronnie to stay away for fear of hurting her. Her editor and ex-boyfriend, Stathis, reinforces this separation by comparing Seth to Typhoid Mary, casting him as a threat whose exclusion seems justified by the danger he represents.

The film acknowledges the challenges of loving someone whose condition is progressing, but also shows how those challenges are compounded by stigma and fear. Stathis portrays Seth as someone to fear or abandon, while Seth’s own shame and self-imposed isolation make it increasingly difficult for Ronnie to remain close to him. Caught between her concern for Seth and her fears about his transformation, Ronnie struggles to maintain their connection. As Seth becomes increasingly unrecognizable, his humanity risks being eclipsed by the fear and revulsion his body provokes.

These anxieties extend to the possibility of a future child. When Ronnie learns she is pregnant, she fears that Seth’s genetic mutation could be passed on, confronting uncertainty about what the pregnancy might mean for their future. Her dream of giving birth to a larva transforms these fears into a visceral image of monstrous birth. While Ronnie’s grappling with uncertainty is understandable, the imagery also invites us to examine the assumptions through which we imagine lives shaped by disability. By rendering the possibility of a genetic condition as grotesque and inhuman, The Fly draws on cultural biases that position disability and bodily difference as frightening, undesirable, and incompatible with an acceptable future.

The Horror of an Unrecognizable Future

Seth’s final transformation fuses him with the fly and the telepod, collapsing the boundaries between human, insect, and machine. The technology that promised mastery over time, space, and the body becomes part of his undoing. Through Seth’s fate, Cronenberg dramatizes the limits of human control and exposes the corporeal realities we work to keep at a distance: physical decay, the dying process, and death. The film magnifies these fears into horror, making visible our discomfort with the fact that we cannot fully control or transcend our physical existence.

Yet the imagery draws on familiar cultural associations between bodily difference, monstrosity, and a fate worse than death. Seth’s plea for Ronnie to kill him presents death as the ultimate escape from his transformed body. This is a common horror conceit, but it also invites us to consider the assumptions that make such an ending emotionally legible: that a body radically altered is a body no longer worth inhabiting, or that profound physical difference renders a life unimaginable. 

The point is not to equate Seth’s fantastical transformation with the lived experiences of illness or disability, nor to dismiss the suffering the film depicts. Rather, The Fly offers an opportunity to examine how our fear of bodily vulnerability shapes the stories we tell about it. We can engage with the film as a way to confront our discomfort with corporeality, mortality, and the limits of control—or allow its imagery to reinforce the idea that bodies that frighten or unsettle us are somehow less worthy of recognition and care. The horror lies in our inability to escape the body’s limits; the ethical question is whether we allow that fear to shape how we value others.