However, due to the 2011 Tōhoku earthquake and tsunami, the airing of this episode was postponed by one week to April 3, 2011. The episode was originally set to premiere on March 27, 2011. The 28th episode of Kamen Rider OOO serves as the 1000th episode of the Kamen Rider Series since Kamen Rider premiered on April 3, 1971. The title OOO signifies the three medals that the main Kamen Rider uses to transform as well as being representative of the infinity symbol ( ∞ ) with an additional circle. Both 'OOO' and 'Ooz' are intended to be read as 'O's', referring to the multiple uses of the letter O in the title as well as 'multiple kings' ( 王ｓ, Ōzu). Unlike several previous Heisei Rider Series, no alternate name has been given yet for the three O's in the title ( Ｗ（ダブル） read as 'Double' and 555（ファイズ） read as 'Φ's/Phi's/Faiz') aside from an alternate spelling of the name of the main Kamen Rider: Ooz. The creature designers are Yutaka Izubuchi, known for his work on the Lords in Kamen Rider Agito, and Tamotsu Shinohara, known for his work on the Mirror Monsters of Ryuki, the Orphnoch of Kamen Rider 555, and the Fangires of Kamen Rider Kiva. OOO is written by Yasuko Kobayashi, known for the screenplays of Seijuu Sentai Gingaman, Mirai Sentai Timeranger, Kamen Rider Ryuki, Den-O, and Samurai Sentai Shinkenger. The Kamen Rider OOO trademark was registered by Toei on April 8, 2010. The Yamano Beauty Special School in Shibuya, Tokyo, stands in for the lavish offices of Kamen Rider OOO 's Kougami Foundation. The series' titular Kamen Rider made a cameo appearance in the film Kamen Rider W Forever: A to Z/The Gaia Memories of Fate and a supporting character in other Kamen Rider movies. It began airing on September 5, 2010, the week following the conclusion of Kamen Rider W, joining Tensou Sentai Goseiger and then Kaizoku Sentai Gokaiger in the Super Hero Time lineup, until its conclusion on August 28, 2011. Kamen Rider OOO ( 仮面ライダーオーズ／ＯＯＯ, Kamen Raidā Ōzu) is a 2010-2011 Japanese tokusatsu drama in Toei Company's Kamen Rider Series, being the twelfth series in the Heisei period run and the twenty-first overall.

Kamen rider ooo episode 9