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Icon-build.png This article is about a/an episode in Kamen Rider Build.
Red alert.jpg WARNING: This episode contains scenes of blood and bloodshed. Viewer discretion is advised!

The Ultimate Phase (究極のフェーズ Kyūkyoku no Fēzu) is the thirty-seventh episode of Kamen Rider Build. It features the debut of the Great Dragon Evolbottle, Great Cross-Z Dragon, and Great Cross-Z, as well as the full debut of Evol Black Hole Form, having appeared as a silhouette in the previous episode.


Had their operation succeeded, Evolto would have disappeared alongside Build. However, Evolto avoided death by possessing Sento’s body instead! But something else has happened. Because Evolto’s genetic signature was removed from Ryuga’s body after he possessed Sento, he can no longer transform into Cross-Z. Even so, Evolto was still strong enough to take over Sento’s body. In a state where he can no longer transform into Cross-Z, is there a chance that they can still defeat him?


to be added


Suit Actors

Forms and Collectibles Used



  • Jelly used:
    • Grease
      • Robot


  • Bottle used:
  • Form used:
    • Cross-Z
      • Great Cross-Z
    • Evol
      • Rabbit Form (Phase 3), Cobra Form (Phase 1), Black Hole Form (Phase 4: Perfection)


  • Gear used:
    • Engine Bro's
      • Gear Engine
    • Remocon Bro's
      • Gear Remocon
    • Hell Bro's
      • Gear Engine, Gear Remocon


Kazuya Okada's face

  • Right after Kamen Rider Evol slap on Ryuga's face, the suit actor of Evol, Kazuya Okada, can be seen not wearing the mask.


Build 37 CS.png

  • Closing Screen Evolbottles:
    • Kamen Rider: Cross-Z
    • Evolbottles: Dragon, Great Dragon
  • Count at episode end
    • Bottles in Build's possession: FullFull RabbitTank
    • Bottles in Cross-Z's possession:
    • Bottles in Grease's possession:
      • Biotic: Kuwagata, Fukurou
      • Abiotic: Castle
    • Bottles in Rogue's possession: Bat, Crocodile Crack
    • Bottles in Evol's possession: Cobra
    • Jellies in Grease's possession: Robot
    • Gears in Engine Bro's's possession: Gear Engine
    • Gears in Remocon Bro's's possession: Gear Remocon
    • Evolbottles in Cross-Z's possession:
    • Evolbottles in Evol's possession:
      • Biotic: Cobra, Rabbit
      • Abiotic: Rider
    • Bottles at nascita:
      • Biotic: Rabbit, Taka, Panda, Dragon, Kaizoku
      • Abiotic: Tank, Gatling, Rocket, Lock, Densya
      • Other: RabbitTank Sparkling
    • Bottles in Pandora Box:
      • Biotic: Gorilla, Ninjya, Harinezumi, Lion, Octopus, Phoenix, Wolf, Unicorn, Rose, Turtle, Kabutomushi, Kuma, Dog, Santa Claus, Spider, Tora, Kujira, Shika, Kirin, Penguin, Obake, Same, Bat, Hachi, Sai
      • Abiotic: Diamond, Comic, Syoubousya, Soujiki, Light, Robot, Smapho, Keshigomu, Helicopter, Watch, Camera, Televi, Mic, Cake, Reizoko, UFO, Jet, Pyramid, Senpuki, Sukebo, Magnet, Bike, Engine, Sensuikan, Dryer
  • This is the first episode since it's debut that Sento does not assume Build RabbitRabbit Form. 
    • It is also the first episode where Sento doesn't transform into Build due to him being possessed by Evolto.

External links