Kamen Rider is a long-running Japanese tokusatsu franchise created by Shotaro Ishinomori, with the first television series premiering in 1971 from Toei. Henshin, meaning transformation in Japanese, became the series' defining ritual as each hero uses a special belt to change form. Over decades of new seasons, films, and toys, the belt sounds and shouted calls became instantly recognizable to fans. Online, clips of the sequence spread through anime and tokusatsu communities, where it is now reused as a universal power-up sound.