FAMOUS MONSTERS OF FILMLAND was originally conceived as a one-shot publication by James Warren and forrest j ackerman, published in the wake of the widespread success of the package of old horror movies syndicated to American television in 1957. But the first issue, published in February 1958, was so successful that it required a second printing to fulfill public demand. Its future as part of American culture was immediately obvious to both men. The success prompted spinoff magazines such as Monster World, Spacemen, Favorite Westerns of Filmland, Screen Thrills Illustrated, Creepy, Eerie, Vampirella, The Rook and a series of "Warren Specials" 

FAMOUS MONSTERS OF FILMLAND directly inspired the creation of many other similar publications, including Castle of Frankenstein, Horror Monsters, Mad Monsters, Modern Monsters, Monster Mania, Cinefantastique, Fangoria, The Monster Times, and Video Watchdog. In addition, hundreds, if not thousands, of FM-influenced horror, fantasy and science fiction movie-related fanzines have been produced, some of which have continued to publish for decades, such as Midnight Marquee, Scary Monsters, Rue Morgue, and Little Shoppe of Horrors. [wiki]