Appears in: The Fly (1986)
Scariest moment: Inside Seth Brundle's (Jeff Goldblum) laboratory, Stathis Borans (John Getz) tries to rescue Veronica Quaife (Geena Davis) from the Brundlefly when the half-man/half-insect dissolves Stathis' left hand and right foot with its acid-like vomit.
Weakness: The charms, and, let's be real, hotness of Veronica Quaife (played by Geena Davis).

You can't help but feel bad for the Brundlefly, the man/insect mutant that scientist Seth Brundle (Jeff Goldblums) morphs into in David Cronenberg's superb body-horror flick The Fly. It's not like Brundle wanted to physically alter himself into one of the most repulsive monsters ever seen in a movie—it was just a case of bad luck.

As in, a pesky housefly buzzed into the teleportation chamber that Brundle designed for himself to enter and prove modern science's perceived limitations wrong. Gradually, Brundle's exterior changes into that of a man-sized fly, and, since this is a Cronenberg picture, it's always hideous to look at.

And when Goldblum finally becomes the full-blown Brundlefly, Cronenberg works his storytelling magic, asking viewers to both shriek at and sympathize with the creature you see above. Answering "yes" to both inquiries is guaranteed.