Tokusatsu is a Japanese term for live-action films or television programs that make heavy use of practical special effects. Credited to special effects director Eiji Tsuburaya, tokusatsu mainly refers to science fiction, superhero, fantasy, or horror media featuring such technology but is also occasionally dubbed a genre itself. Its contemporary use originated in the Japanese mass media around 1958 to explain special effects in an easy-to-understand manner and was popularized during the "first monster boom" (1966–1968). Prior to the monster boom, it was known in Japan as tokushu gijutsu or shortened tokugi .