The Cranks are flesh eating humans who have been affected by the Flare and gone insane and go around the
Scorch in the dark. They are villains in the young-adult post-apocalyptic sci-fi Maze Runner book series and the tertiary antagonists of the 2015 movie adaptation Maze Runner: Scorch Trials
They are described as scarred, purple and black, long arms and mindless creatures and the later ones have vine like appearances and they seem no capable of speech. When a person is bit or scratched by a Crank, they get turned into one as shown when they bite Winston and Brenda in the movie.
They are also shown to be very quick to be fooled when Thomas tricks a gang of them to fall out a window in the movie.