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The Fly
Seth Brundle, a brilliant but eccentric scientist, meets Veronica "Ronnie" Quaife, a science journalist, at a press event. He takes her back to his home and laboratory and shows her his invention: a set of "telepods" that allows instantaneous teleportation between them. Seth convinces Ronnie to keep the invention secret in exchange for exclusive rights to the story, and she documents his work. Although the telepods can transport inanimate objects, they mutilate live tissue, as demonstrated when a baboon is turned inside-out during an experiment.
Seth and Ronnie begin a romantic relationship. Their first sexual encounter inspires Seth to reprogram the telepod to understand the makeup of living tissue. After he successfully teleports a second baboon, Ronnie hurriedly leaves to confront her editor Stathis Borans about his threat, spurred by his jealousy of Seth, to publish the story without her consent. Embittered and convinced she is rekindling her relationship with Stathis, Seth teleports himself alone, unaware that a housefly has slipped inside the transmitter pod with him. He emerges from the receiving pod seemingly normal. Seth and Ronnie later reconcile.
Seth starts to exhibit increased strength, stamina, and sexual potency, which he attributes to the teleportation "purifying" his body. Ronnie grows concerned about Seth's changing personality and the strange, bristly hairs growing from a wound on his back. Seth becomes arrogant and violent, insisting that the teleportation process is beneficial, and tries to force Ronnie to undergo teleportation. When she refuses, he abandons her, goes to a bar and partakes in an arm-wrestling match, where he leaves his opponent with a compound fracture. He brings a woman named Tawny back to his warehouse to have intercourse. When Seth tries to coerce her into teleporting, Ronnie stops him and Seth throws her out as well.
When his fingernails begin falling off, Seth realizes something is wrong. He reviews the telepod's computer and discovers that there was a fly in the pod with him. The computer, confused by the presence of two lifeforms, fused him with the fly at the molecular-genetic level.
Seth continues to deteriorate, losing body parts and becoming less human in appearance. After several weeks, he reconnects with Ronnie and says he is becoming a hybrid of human and insect he nicknamed "Brundlefly." He has begun vomiting digestive enzymes onto his food to dissolve it and gained the ability to cling to walls and ceilings. He also realizes that he is losing his human reason and compassion, driven by primitive impulses he cannot control.
Seth installs a fusion program into the telepod computer, planning to dilute the fly genes in his body with human DNA. Ronnie learns that she is pregnant by Seth, but does not know if the conception occurred before or after Seth's genes were corrupted. She worries that the child will not be human, and has a nightmare of giving birth to a giant maggot. She visits Brundle in order to break the news to him, but he warns her that he will harm her if she continues to visit. Terribly upset, she has Stathis persuade a doctor to perform an abortion in the middle of the night. Having overheard their conversation, Seth abducts Ronnie and begs her to carry the child to term, since it may be the last remnant of his humanity. Stathis breaks into Seth's lab with a shotgun, but Seth incapacitates him with his corrosive vomit.
Seth reveals his desperate plan to Ronnie: he will use the telepods to fuse himself and her, together with their unborn child, into one entity. As Seth drags her into one of the telepods, she accidentally rips off his jaw, triggering his final transformation into an insectoid-human "Brundlefly" creature, shedding his decayed human skin. Brundlefly traps Ronnie inside the first telepod and enters the other, planning to use the prototype pod as the receiver of the combination of pods 1 and 2. The wounded Stathis uses his shotgun to sever the cables connecting Ronnie's telepod to the computer, allowing Ronnie to escape. The damage causes telepod 2 to malfunction and Brundlefly attempts to smash his way through the door, only for the pod to activate just as he is stepping out, fusing the creature to a piece of the door and other components. The prototype pod receives the Brundlefly/Telepod fusion successfully; as the door opens, the resulting creature falls out of the door and to the ground. He crawls to Ronnie and silently requests for her to end his misery by aiming Stathis' shotgun barrel, which she had picked up, at his own head. She eventually, and tearfully, shoots and kills him, falling to her knees in despair.