Starting with "The Wolf Man" (in 1941), Universal Studios made five movies featuring The Wolf Man, a character portrayed by Lon Chaney, Jr. Monster by Moonlight! explores these movies. Rick Baker explains how the make-up was done on Chaney's character. Screenwriter Curtis Siodmak took very little from earlier werewolf legends, providing his own story for some of the films. This documentary displays clips from several other movies, including "Abbott & Costello Meet Frankenstein" (1948) and "House of Dracula" (1945).

In the first two films we learn the character's origins, including his childhood and how he learned his fighting skills. Later, he must face his friend, who has joined a gang of criminals.

Fourth Moonlight Mask theatrical film.