The Human Centipede 1: The internationally respected surgeon Dr. Josef, who specializes in the surgery of conjoined twins, has a curious vision of the future of the human race. Two handsome female American tourists are stranded on his luxurious estate. However, the next day, like a Japanese man, they wake up in his basement. But the surgeon does not intend to separate them like the conjoined twins, but rather to put them together.
The Human Centipede 2: A man becomes sexually obsessed with the DVD of horror film 'The Human Centipede (First Sequence) ' to watch. He uses sandpaper to satisfy himself while watching the movie. He decides to make his own "Human Centipede" from 12 victims and use his own "centipede" to satisfy his own sexual pleasure.
The Human Centipede 3: Bill Boss (Dieter Laser) and Dwight Butler (Laurence R. Harvey) close join together and form an evil duo. They want to create a 'human centipede', where people are joined through the recta and mouths, creating a unique, common digestive system. Their plan is to make a 500-person 'centipede' consisting of inmates.