This article is about a/an episode in Kamen Rider Build.
Red alert 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 the return of the Hokuto Sanbagarasu as imitations made by Evolto as well as the debut of the North Blizzard Fullbottle and Kazumi's first transformation into Grease Blizzard Form. It also features the first appearance of the white Last Pandora Panel.


Suddenly Evolto, who was impersonating Seito's 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!


to be added


Guest Casts

Suit Actors

Forms and Collectibles Used


  • Bottle used:
    • Build
      • Biotic: N/A
      • Abiotic: N/A
      • Other: Genius
    • Cross-Z
    • Grease
    • Rogue
      • Biotic: Crocodile Crack
      • Abiotic: N/A
  • Form(s) used:
    • Build
      • Genius Form
    • Cross-Z
      • Cross-Z Magma
    • Grease
      • Grease Blizzard


  • Jelly used:
    • Grease
      • Robot


  • Bottle used:
  • Form used:
    • Evol
      • Black Hole Form (Phase 4: Perfection), Cobra Form (Phase 1)


  • Kazumi does not pull the handle over the Blizzard Knuckle before inserting it into the Build Driver. This error is carried over to the next episode as well.


Build EP46 CS
  • 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:
    • 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:
    • Lost Bottles in Evol's possession:
      • Biotic: Bat, Cobra, Shimauma, Fukurou, Kuwagata
      • Abiotic: Hasami, Spanner, CD
  • 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.

External links


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