Japanese loanword which originally meant both "special effects" in general and more specifically, a genre of live-action Japanese entertainment, encompassing many subgenres of film and television; however, in non-Japanese languages, it only refers to the second definition. Tokusatsu generally has science fiction, fantasy, or horror themes, but this is not always the case. The most popular types of tokusatsu entertainment are kaiju movies (the Godzilla and Gamera film series), superhero TV serials (the Kamen Rider and Metal Heroes series), and mecha dramas (Giant Robo), or combinations of all of them (the Ultraman and Super Sentai series).