The Super Sentai Series is the name given to the long-running Japanese superhero team genre of shows produced by Toei Co., Ltd., Toei Agency and Bandai, and aired by TV Asahi ("Super" refers to their use of mecha, and "sentai" is the Japanese word for "task force" or, literally, "fighting squadron" and was also a term used for Japanese squadrons in World War II). The shows are of the tokusatsu genre, featuring live action characters and colorful special effects, and are aimed mainly at children. The Super Sentai Series is one of the most prominent tokusatsu productions in Japan, alongside the Ultra Series and the Kamen Rider Series, which it currently airs alongside in the Super Hero Time programming block on Sundays. Outside Japan, the Super Sentai Series are best known as the source material for the Power Rangers franchise.