Kamen Rider OOO (仮面ライダーOOO(オーズ) Kamen Raidā Ōzu?) will be the twelfth series in the Heisei period run of the Kamen Rider Series, and the twenty-first overall. It is scheduled to begin airing on September 5, 2010, the week following the conclusion of Kamen Rider Double.[1] The series' titular Kamen Rider will have a cameo appearance in the film Kamen Rider Double Forever: A to Z/The Gaia Memories of Fate.