- Core Medal Resurrection/Introduction - Eiji Hino returns after years of wandering in search for a way to revive Ankh. He is reunited with Hina Izumi. While Eiji was absent, Hina is fighting the revived Greeed with Chiyoko Shiraishi. Appearing in this episode are: Shu Watanabe as Eiji Hino/Kamen Rider OOO, Riho Takada as Hina Izumi, Marie Kai as Chiyoko Shiraishi, and Taito Hashimoto as Kazari.
- Birth X Birth/Introduction - Chairman Kougami has developed "something" to combat Ancient OOO and the Greeed. He gives Gotou a box filled with Core Medals. This will give birth to Kamen Rider Birth X! Appearing in this episode are: Asaya Kimijima as Shintaro Gotou/Kamen Rider Birth X, Hiroaki Iwanaga as Akira Date/Kamen Rider Birth, Mayuko Arisue as Erika Satonaka, and Takashi Ukaji as Kousei Kougami. Both episodes are narrated by series narrator Jouji Nakata.
[Additional info: Dengeki Hobby]