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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 graphic violence and murder. Viewer discretion is advised!

The Scientist of Hope (希望のサイエンティスト Kibō no Saientisuto) is the forty-fifth episode of Kamen Rider Build. It features the revival of Evolto and the debut of his monster form. It also features the death of Shinobu Katsuragi and Sento upgrading Genius Form with the Hazard Trigger.


The four Kamen Riders joined forces together and were finally able to defeat Evolto! Three Lost Fullbottles that were being held in Evolto’s protection have been purified thanks to his defeat, and have been taken by Sento’s father, Shinobu! Shinobu then proceeds to guide the others to a room containing the black Pandora Panel. He then starts to reveal to them his true intentions…


to be added


Guest Casts

Suit Actors

Forms and Collectibles Used


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


  • Jelly used:
    • Grease
      • Robot


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


DX and Prop Evol-Drivers.png

  • Like episode 34, in this episode Evolto, as MadRogue, is in possession of two different props of the Evol-Driver. His hand is holding the DX toy while the normal, larger prop is on his waist.
  • Sento uses the Hazard Trigger alongside the Genius Fullbottle in this episode. Despite the combination not giving him a unique new form, the Hazard Trigger announces "Over Flow" in the beginning and does not announce "Yabee" in the end.


Double Trigger CS.png

  • Closing Screen Devices:
  • Count at episode end
    • Bottles in Build (Sento)'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: Castle
    • 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
  • Shinobu asking Sento if he'd grown taller is an accurate observation since Atsuhiro Inukai is in fact actually taller than Yukiaki Kiyama.
  • When Sento transforms into Genius Form, his Hazard Trigger is also attached, which reveals that the Hazard Trigger only give the black armor transformation for the regular Fullbottles, the Great Cross-Z Dragon and the FullFull RabbitTank Fullbottle.
  • The planet in which Evolto warps Build to greatly resembles the Planet of Helheim.
  • This is the last time that Seiji Takaiwa will be the suit actor for Kamen Rider Build since he will be filming for Kamen Rider Zi-O. Yuji Nakata will be Takaiwa's substitute and portrays Build in-suit from this point on.
  • The TV announcement at the end of the episode that Kengo Ino, Ryoka Saiga, and Mitsuomi Gobara will become the new governors directly ties into the events of the the summer film, which in turn, the post-credits scene of the film directly ties into the events of the next episode.

External links