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WARNING: This episode contains scenes of blood and bloodshed. Viewer discretion is advised! |
An Oath to Be The One (誓いのビー・ザ・ワン, Chikai no Bī za Wan) is the forty-sixth episode of Kamen Rider Build. It features Kazumi's first transformation into Grease Blizzard Form. It also features the first appearance of the white Last Pandora Panel.
Synopsis[]
Suddenly Evolto, who was impersonating Seito's late Prime Minister Mido, reveals himself to the world and his intentions to destroy it! This marks the beginning of the final battle of Evolto vs. humanity. All of the Kamen Riders including Sento are determined to fight until the end. Their key to victory lies in the White Pandora Panel originating from the data that Shinobu left behind. Evolto's planetary destruction has begun. The fight for the last Lost Fullbottle is on the line. The Kamen Riders set their aim at the summit of the Pandora Tower, and Evolto himself!
Plot[]
to be added
Cast[]
- Sento Kiryu (桐生 戦兎, Kiryū Sento): Atsuhiro Inukai (犬飼 貴丈, Inukai Atsuhiro)
- Ryuga Banjo (万丈 龍我, Banjō Ryūga): Eiji Akaso (赤楚 衛二, Akaso Eiji)
- Kazumi Sawatari (猿渡 一海, Sawatari Kazumi): Kouhei Takeda (武田 航平, Takeda Kōhei)
- Misora Isurugi (石動 美空, Isurugi Misora): Kaho Takada (高田 夏帆, Takada Kaho)
- Nariaki Utsumi (内海 成彰, Nariaki Utsumi): Yuki Ochi (越智 友己, Ochi Yūki)
- Sawa Takigawa (滝川 紗羽, Takigawa Sawa): Yukari Taki (滝 裕可里, Taki Yukari)
- Takumi Katsuragi (葛城 巧, Katsuragi Takumi): Yukiaki Kiyama (木山廉彬, Kiyama Yukiaki)
- Gentoku Himuro (氷室 幻徳, Himuro Gentoku): Kensei Mikami (水上剣星, Mikami Kensei)
- Akaba (赤羽 ): Eishin (栄信 )
- Aoba (青羽 ): Tateto Serizawa (芹澤興人, Serizawa Tateto)
- Kiba (黄羽 ): Takuya Yoshimura (吉村卓也, Yoshimura Takuya)
- Masakuni Mido (御堂正邦, Midō Masakuni): Norimasa Fuke (冨家規政, Fuke Norimasa)
- Evolto (エボルト, Eboruto, Voice), Evol-Driver (エボルドライバー, Eboru Doraibā, Voice): Tetsuo Kanao (金尾 哲夫, Kanao Tetsuo)
- Build Driver (ビルドドライバー, Birudo Doraibā, Voice): KORBY (コービー, Kōbī)
- Sclash Driver (スクラッシュドライバー, Sukurasshu Doraibā, Voice): Norio Wakamoto (若本 規夫, Wakamoto Norio)
Guest Casts[]
- TV Reporters: Shiho Matsushima (松島志歩, Matsushima Shiho), Hiroaki Hirakawa (平川 博晶, Hirakawa Hiroaki), Chitose (千十千 )
Suit Actors[]
- Kamen Rider Build: Yuji Nakata (中田 裕士, Nakata Yūji)
- Kamen Rider Cross-Z Magma: Eitoku (永徳 )
- Kamen Rider Grease (Blizzard): Satoshi Fujita (藤田 慧, Fujita Satoshi)
- Kamen Rider Rogue: Jun Watanabe (渡辺 淳, Watanabe Jun)
- Kamen Rider Evol: Kazuya Okada (岡田 和也, Okada Kazuya)
Forms and Collectibles Used[]
Fullbottles[]
- Bottle used:
- Build
- Biotic: N/A
- Abiotic: N/A
- Other: Genius
- Cross-Z
- Biotic: Dragon Magma
- Abiotic: N/A
- Other: Cross-Z Magma Knuckle
- Grease
- Biotic: N/A
- Abiotic: N/A
- Other: North Blizzard, Grease Blizzard Knuckle
- Rogue
- Biotic: Crocodile Crack
- Abiotic: N/A
- Build
- Form(s) used:
- Build
- Genius Form
- Cross-Z
- Cross-Z Magma
- Grease
- Grease Blizzard
- Build
Sclashjellies[]
- Jelly used:
- Grease
- Robot
- Grease
Evolbottles[]
- Bottle used:
- Evol
- Biotic: Cobra
- Abiotic: Rider
- Other: Evol Trigger
- Evol
- Form used:
- Evol
- Black Hole Form (Phase 4: Perfection), Cobra Form (Phase 1)
- Evol
Errors[]

- Kazumi does not pull the handle over the Grease Blizzard Knuckle before inserting it into the Build Driver. This error is carried over to the next episode as well.
Notes[]
- As part of Super Hero Time, this episode aired alongside Kaitou Sentai Lupinranger VS Keisatsu Sentai Patranger
episode 25, Number 25: Make it the Strongest
.
- Viewership: 2.8%
- Formula of the title: (Cube root)

- Closing Screen Fullbottle:
- Kamen Rider: Grease Blizzard
- Fullbottle: North Blizzard
- Count at episode end
- Bottles in Build's possession:
- Biotic: Gold Rabbit
- Abiotic: N/A
- Other: RabbitTank Sparkling, FullFull RabbitTank, Genius
- Bottles in Cross-Z's possession:
- Biotic: Silver Dragon, Dragon Magma
- Abiotic: N/A
- Other: Cross-Z Dragon, Cross-Z Magma Knuckle
- Bottles in Grease's possession:
- Biotic: N/A
- Abiotic: Castle
- Other: North Blizzard
- Bottles in Rogue's possession: Crocodile Crack
- Bottles in Evol's possession:
- Biotic: Gorilla, Taka, Ninjya, Panda, Harinezumi, Lion, Kaizoku, Octopus, Phoenix, Wolf, Unicorn, Rose, Turtle, Kabutomushi, Kuma, Dog, Santa Claus, Spider, Tora, Kujira, Shika, Kirin, Penguin, Obake, Same, Hachi, Sai
- Abiotic: Tank, Diamond, Gatling, Comic, Rocket, Syoubousya, Soujiki, Lock, Densya Light, Robot, Smapho, Keshigomu, Helicopter, Watch, Camera, Televi, Mic, Cake, Reizoko, UFO, Jet, Pyramid, Senpuki, Sukebo, Magnet, Bike, Sensuikan, Dryer, Hammer
- Bottles in MadRogue's possession:
- Biotic: Bat
- Abiotic: Engine
- Jellies in Grease's possession: Robot, Dragon
- Evolbottles in Evol's possession:
- Biotic: Cobra, Rabbit
- Abiotic: Rider
- Evolbottles in Cross-Z's possession:
- Biotic: Great Dragon
- Other: Great Cross-Z Dragon
- Lost Bottles in Evol's possession:
- Biotic: Bat, Cobra, Shimauma, Fukurou, Kuwagata
- Abiotic: Hasami, Spanner, CD
- Bottles in Build's possession:
- The concept of parallel worlds from Kamen Rider Heisei Generations Final: Build & Ex-Aid with Legend Riders is revisited in this episode. However, a crucial difference is highlighted in that while Kaisei Mogami's Enigma destroys worlds, the simultaneous use of both the black and white Box's panels fully merges them into an entirely new one instead.
- The scene in which the characters imagine the two worlds colliding is taken directly from the film.
- Cross-ZBuild Form is first shown during the commercial break of this episode's airing, ahead of the film's release.
- It features the return of the Hokuto Sanbagarasu as imitations made by Evolto.