Extradimensional Mother (異次元かあさん I Jigen Kāsan) is the twenty second episode of Ultraman R/B.
All the way from the other dimension, their long-lost mother, Mio Minato finally returns to the family! It seems that Mio was finally able to escape the grasp of the vicious kaiju, Kamisori Demaaga, and reunite with her family after 15 long years! Ushio is extremely impressed by what she has done, however Katsumi and the others, who haven’t known their mother for very long, seem somewhat confused. Just then, Saki Mitsurugi feels the pulse of the Earth’s ray energy, and the vicious kaiju, Kamisori Demaaga’s excavation towards the Earth’s core! Saki intends to destroy Kamisori Demaaga in order to protect the precious energy, however…
- Katsumi & Isami: R/B Crystal Navi!
- Isami: We are going to be studying R/B Crystals now Katsumi!
- Katsumi: Yeah. Today's crystal... is this!
- Gyro: Grigio Regina!
- Isami: Super Armored Monster Grigio Regina! Height: 65 Meters. Weight: 91,000 Tons. Grigio's strongest form. It is clad in a hard organic armor that can even deflect the Ruebe Vortex Buster.
- Katsumi & Isami: Be sure to watch next time!
- Katsumi Minato (湊カツミ Minato Katsumi): Yuya Hirata (平田 雄也 Hirata Yuya)
- Isami Minato (湊イサミ Minato Isami): Ryosuke Koike (小池 亮介 Koike Ryōsuke)
- Asahi Minato (湊アサヒ Minato Asahi): Arisa Sonohara (其原 有沙 Sonohara Arisa)
- Ushio Minato (湊ウシオ Minato Ushio): Ginnojo Yamazaki (山崎 銀之丞 Yamazaki Ginnojō)
- Mio Minato (湊 ミオ Minato Mio): Kaori Manabe (眞鍋かをり Manabe Kaori)
- Saki Mitsurugi (美剣サキ Mitsurugi Saki): Ayane Kinoshita (木下 彩音 Kinoshita Ayane)
- Ultraman Rosso: Hideyoshi Iwata (岩田 栄慶 Iwata Hideyoshi)
- Ultraman Blu: Satoru Okabe (岡部 暁 Okabe Satoru)
- Kamisori Demaaga: Kenji Kajikawa
- Horoboros: Shun Takanashi