Seth Brundle is an eccentric but brilliant scientist who believes he has created a revolutionary teleportation device. After demonstrating the technology to journalist Veronica Quaife, Seth decides to test it on himself. Unknown to him, a fly enters the teleportation chamber with him, causing the machine to merge their genetic material. At first, Seth believes the experiment has made him stronger, faster, and healthier. But his body soon begins a horrifying transformation as insect characteristics gradually replace his humanity. As Veronica watches the man she loves deteriorate, Seth desperately searches for a way to reverse the process. David Cronenberg's acclaimed science-fiction horror film explores love, mortality, disease, and the terrifying consequences of scientific ambition.