The association of Nazism with occultism occurs in a wide range of theories, speculation and research into the origins of Nazism and into Nazism's possible relationship with various occult traditions. Such ideas have flourished as a part of popular culture since at least the early 1940s (during World War II), and gained renewed popularity starting in the 1960s. Books on the topic include "The Morning of the Magicians" (1960) and "The Spear of Destiny" (1972). Nazism and occultism have also been featured in numerous documentaries, films, novels, comic books, and other fictional media. Typical examples include the film "Raiders of the Lost Ark" (1981), the Wolfenstein video game series, and the comic-book series Hellboy (1993 onwards).