George Waggner's 1941 horror film "The Wolf Man" introduced audiences to, essentially, the "second officer" of the Universal Monsters canon. Everyone knows that Dracula is the captain of the monster ship, and that Frankenstein is his first officer (a position he often shares with the Bride). The Wolf Man is always third in command, perhaps serving as a security officer or an enforcer. Mummies, gillmen, invisible men, Dr. Hydes, and other ancillary ghouls serve lower down in the crew. 

Watching the original "Wolf Man" film, however, reveals a dark and sad tale about Larry Talbot who is attacked by a wolf on a misty night in Wales, afflicting him with the curse of the werewolf. Throughout the year, Larry will transform into an animalistic wolf/human creature and stalk and kill random victims. The tale is terrifying and tragic and inspired many pop culture tales to follow -- as well as many nightmares.