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!

The Unstoppable Genius (ジーニアスは止まらない Jīniasu wa Tomaranai) is the thirty-ninth episode of Kamen Rider Build. It features the full debut of Kamen Rider MadRogue after his brief appearance at the end of the previous episode and the debut of the Genius Fullbottle. It also features Sento's complete mental assimilation with Takumi Katsuragi as well as his first transformation into Build Genius Form.


Evolto, who has taken in Utsumi from Namba Heavy Industries, has awakened him as Kamen Rider MadRogue! Awakening within Sento has Katsuragi’s memories returned to him once again! Evolto decides to refrain from destroying the Earth immediately as he attempts to complete his human control. Fierce battles are waged against Evolto as the Riders try and develop new forms of technology to use against him. One of these options, is to harness Evolto’s genetic structure hidden within Ryuga’s body…


to be added


Suit Actors

Forms and Collectibles Used


  • Bottle used:
    • Build
      • Biotic: FullFull RabbitTank (Rabbit Mode)
      • Abiotic: N/A
      • Other: Hazard Trigger, Genius
    • Grease
    • Rogue
      • Biotic: Crocodile Crack
      • Abiotic: N/A
    • MadRogue
      • Biotic: Bat, Kaizoku
      • Abiotic: Engine
  • Form used:
    • Build
      • RabbitRabbit Form, Genius Form


  • Jelly used:
    • Grease
      • Robot


  • Bottle used:
  • Form used:
    • Evol
      • Black Hole Form (Phase 4: Perfection)
    • Cross-Z
      • Great Cross-Z


  • to be added


Genius Bottle CS
  • Closing Screen Fullbottles:
    • Kamen Rider: Build
    • Fullbottle: Genius
  • Count at episode end
    • Bottles in Build's possession: RabbitTank Sparkling, FullFull RabbitTank, Genius
    • Bottles in Cross-Z's possession:
    • Bottles in Grease's possession:
      • Biotic: Kuwagata, Fukurou
      • Abiotic: Castle
    • Bottles in Rogue's possession: Crocodile Crack
    • Bottles in Evol's possession:
      • Biotic: Rabbit, Gorilla, Taka, Ninjya, Panda, Harinezumi, Lion, Dragon, 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
    • Bottles in MadRogue's possession:
      • Biotic: Bat, Kaizoku
      • Abiotic: Engine
    • Jellies in Grease's possession: Robot
    • Evolbottles in Evol's possession:
      • Biotic: Cobra, Rabbit
    • Evolbottles in Cross-Z's possession:
    • Evolbottles in MadRogue's possession:
      • Abiotic: Rider
    • Lost Bottles in Evol's possession:
      • Biotic: Bat, Cobra, Shimauma
      • Abiotic: Hasami
  • This episode's title ("Genius wa Tomaranai") is a callback to the title of episode 21, The Unstoppable Hazard ("Hazard wa Tomaranai").
  • The episode title may be referring to Genius Form itself, in the case that it's so powerful that no enemy can defeat it.
    • But as Genius Form is just appear before episode ends and not show any power yet, The title may also refer to Sento, the genius who no matter what happens, will not stop and give up.
    • It may also refer to Utsumi, another genius who become even more insane and the Hero Riders cannot stop him.
Secrectly using two Guns
  • After cutting away from the fight between MadRogue, Great Cross-Z and Grease, MadRogue is shown holding both the Transteam Gun and Nebulasteam Gun with the Bat and Engine Fullbottles inserted before throwing them on the ground.

External links


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