This article is about a/an episode in Kamen Rider Build.

The Truth of the Pandora Box (パンドラボックスの真実 Pandora Bokkusu no Shinjitsu) is the thirtieth episode of Kamen Rider Build. It features the return of the regular Cross-Z form after its last appearance in episode 17 and the debut of the Cross-Z Magma Knuckle and the Dragon Magma Fullbottle. It also features the destruction of Ryuga's Sclash Driver and the Dragon Sclashjelly.


Misora was possessed once again by the spirit of Vernage, the Queen of Mars, as she quickly evacuates all the Riders from the battlefield! Just then, she says something that shocks everyone. “You will be hope…” Sento fights against Stalk to try and reclaim the Pandora Box as they storm the Pandora Tower, and meanwhile, a secret about Banjo is revealed that confirms Vernage’s words…


to be added


Guest Casts

Suit Actors

Forms and Collectibles Used


  • Bottle used:
  • Form used:
    • Build
      • RabbitRabbit Form, RabbitTank Form, TankTank Form
    • Cross-Z
      • Cross-Z


  • Jelly used:
    • Cross-Z Charge
      • Dragon
    • Grease
      • Robot


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


  • When Cross-Z presses the Dragonic Igniter button on the Cross-Z Magma Knuckle after inserting the Taka Fullbottle, the Fullbottle briefly bounces out of the slot a little, likely due to the Fullbottle prop not fitted properly into the slot.


Dragon Stalk CS
  • Closing Screen Fullbottles
  • Count at episode end
    • Bottles in Build's possession:
      • Biotic: Rabbit, Panda, Kaizoku, Unicorn, Rose, Tora, Kujira, Shika, Kirin, Penguin, Obake, Sai
      • Abiotic: Tank, Gatling, Rocket, Densya, Smapho, Keshigomu, Televi, UFO, Jet, Pyramid, Senpuki, Sukebo, Magnet, Dryer
      • Other: RabbitTank Sparkling, FullFull RabbitTank
    • Bottles in Cross-Z's possession:
    • Bottles in Grease's possession:
      • Biotic: Wolf, Kuma, Kuwagata, Fukurou
      • Abiotic: Robot, Helicopter, Castle
    • Bottles in (Night) Rogue's possession: Bat, Crocodile Crack, Phoenix
    • Bottles in Blood Stalk's possession:
      • Biotic: Cobra, Same, Hachi
      • Abiotic: Bike, Sensuikan, Pyramid
    • Jellies in Grease's possession: Robot
    • Gears in Engine Bro's's possession: Gear Engine
    • Gears in Remocon Bro's's possession: Gear Remocon
    • Bottles in Pandora Box:
      • Biotic: Gorilla, Ninjya, Harinezumi, Lion, Octopus, Turtle, Kabutomushi, Dog, Santa Claus, Spider
      • Abiotic: Diamond, Comic, Syoubousya, Soujiki, Light, Watch, Camera, Mic, Cake, Reizoko
  • This is the last time Build uses the RabbitTank Form until the last episode

External links


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