Lycanthrope

A lycanthrope is a werewolve like mutant who needs haircells in order to survive. One of the known lycanthropes was James Adell, who killed several people for their haircells in a season 4 episode. When a lycanthrope had finished, he just looks like an ordinary werwolve. Adell's only appearance was in the episode "Lycanthrope", the third episode of season 4.