Rider Action (ライダーアクション Raidā Akushon) is an opening theme (OP) from Kamen Rider. It was performed by Masato Shimon. It is the theme song of Kamen Rider and one of the opening as well the ending themes of original Kamen Rider series. It is later used during the Ten Riders' battle against Badan's forces in Birth of the 10th! Kamen Riders All Together!!. * Lyrics: Shōtarō Ishinomori * Composition & Arrangement: Shunsuke Kikuchi * Artist: Masato Shimon