Seth Brundle is a fictional character from the 1986 science fiction horror film, The Fly, directed by David Cronenberg. He is a brilliant scientist who invents a teleportation device, aiming to revolutionize transportation. However, his life takes a tragic turn when he accidentally merges his DNA with that of a fly during a test. As the story progresses, Seth undergoes a horrifying transformation into a creature known as Brundlefly. This change affects his physical appearance and mental state, leading to a struggle between his human intellect and the instincts of the fly. His character explores themes of ambition, identity, and the consequences of scientific experimentation.