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Legacy of Doubt (疑惑のレガシー, Giwaku no Regashī) is the forty-second episode of Kamen Rider Build. It features the debut of Shinobu Katsuragi as Kamen Rider Build and the Silver Dragon Fullbottle.
Synopsis
Sento’s father, Shinobu Katsuragi, is alive and is working alongside Evolto! This kind of information is starting to greatly worry Team Build. It seems that Shinobu’s mission is to collect all of the Lost Bottles and add them to the black Pandora Panel. There is even the possibility that Shinobu could be the one who is really pulling the strings. Regardless, Sento believes in the righteous purpose of the system that his father developed, the Rider System. But just then, another Build appears before Sento.
Plot
to be added
Cast
- Sento Kiryu (桐生 戦兎, Kiryū Sento): Atsuhiro Inukai (犬飼 貴丈, Inukai Atsuhiro)
- Ryuga Banjo (万丈 龍我, Banjō Ryūga): Eiji Akaso (赤楚 衛二, Akaso Eiji)
- Kazumi Sawatari (猿渡 一海, Sawatari Kazumi): Kouhei Takeda (武田 航平, Takeda Kōhei)
- Misora Isurugi (石動 美空, Isurugi Misora): Kaho Takada (高田 夏帆, Takada Kaho)
- Nariaki Utsumi (内海 成彰, Nariaki Utsumi): Yuki Ochi (越智 友己, Ochi Yūki)
- Sawa Takigawa (滝川 紗羽, Takigawa Sawa): Yukari Taki (滝 裕可里, Taki Yukari)
- Takumi Katsuragi (葛城 巧, Katsuragi Takumi): Yukiaki Kiyama (木山廉彬, Kiyama Yukiaki)
- Gentoku Himuro (氷室 幻徳, Himuro Gentoku): Kensei Mikami (水上剣星, Mikami Kensei)
- Soichi Isurugi (石動 惣一, Isurugi Souichi): Yasuyuki Maekawa (前川泰之, Maekawa Yasuyuki)
- Masakuni Mido (御堂正邦, Midō Masakuni): Norimasa Fuke (冨家規政, Fuke Norimasa)
- Evolto (エボルト, Eboruto, Voice), Evol-Driver (エボルドライバー, Eboru Doraibā, Voice): Tetsuo Kanao (金尾 哲夫, Kanao Tetsuo)
- Build Driver (ビルドドライバー, Birudo Doraibā, Voice): KORBY (コービー, Kōbī)
- Sclash Driver (スクラッシュドライバー, Sukurasshu Doraibā, Voice): Norio Wakamoto (若本 規夫, Wakamoto Norio)
Guest Casts
- Shinobu Katsuragi (葛城 忍, Katsuragi Shinobu): Joji Kokubo (小久保丈二, Kokubo Jōji)
- TV Announcer: Kenya Matsuki (松木 研也, Matsuki Kenya)
Suit Actors
- Kamen Rider Build (Sento): Seiji Takaiwa (高岩 成二, Takaiwa Seiji)
- Kamen Rider Cross-Z Magma: Eitoku (永徳 )
- Kamen Rider Grease: Satoshi Fujita (藤田 慧, Fujita Satoshi)
- Kamen Rider Rogue: Jun Watanabe (渡辺 淳, Watanabe Jun)
- Kamen Rider Evol, Kamen Rider Build (Shinobu): Kazuya Okada (岡田 和也, Okada Kazuya)
- Kamen Rider MadRogue: Yuji Nakata (中田 裕士, Nakata Yūji)
Forms and Collectibles Used
Fullbottles
- Bottle used:
- Build
- Sento
- Biotic: N/A
- Abiotic: N/A
- Other: Genius, FullFull RabbitTank (in Fullbottle Buster)
- Shinobu
- Biotic: Ninjya (offscreen), Rabbit
- Abiotic: Comic (offscreen), Tank
- Sento
- Cross-Z
- Biotic: Dragon Magma, Silver Dragon (in Cross-Z Magma Knuckle)
- Abiotic: N/A
- Other: Cross-Z Magma Knuckle
- Rogue
- Biotic: Crocodile Crack
- Abiotic: N/A
- MadRogue
- Biotic: Bat
- Abiotic: Engine
- Build
- Form used:
- Build
- Sento
- Genius Form
- Shinobu
- NinninComic Form (offscreen), RabbitTank Form
- Sento
- Cross-Z
- Cross-Z Magma
- Build
Sclashjellies
- Jelly used:
- Grease
- Robot
- Grease
Evolbottles
- Bottle used:
- Evol
- Biotic: Cobra, Rabbit (in Steam Rifle)
- Abiotic: Rider
- Other: Evol Trigger
- Evol
- Form used:
- Evol
- Black Hole Form (Phase 4: Perfection)
- Evol
Errors
- to be added
Notes
- As part of Super Hero Time, this episode aired alongside Kaitou Sentai Lupinranger VS Keisatsu Sentai Patranger
episode 21, Number 21: Foe or Friend, On Board or Not?
.
- Viewership: 3.1%
- Formula of the title: (Partition)
- Fullbottles Obtained: Silver Dragon

- Closing Screen Fullbottles:
- Fullbottles:
- Biotic: Silver Dragon, Gold Rabbit
- Abiotic: N/A
- Fullbottles:
- Count at episode end
- Bottles in Build (Sento)'s possession: RabbitTank Sparkling, FullFull RabbitTank, Genius
- Bottles in Build (Shinobu)'s possession
- Biotic: Rabbit, Ninjya
- Abiotic:Tank, Comic
- Bottles in Cross-Z's possession:
- Biotic: Silver Dragon, Dragon Magma
- Abiotic: N/A
- Other: Cross-Z Dragon, Cross-Z Magma Knuckle
- Bottles in Rogue's possession: Crocodile Crack
- Bottles in Evol's possession:
- Biotic: Gorilla, Taka, 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: Diamond, Gatling, 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, Castle
- 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:
- Biotic: Great Dragon
- Other: Great Cross-Z Dragon
- Lost Bottles in Evol's possession:
- Biotic: Bat, Cobra, Shimauma, Fukurou, Kuwagata
- Abiotic: Hasami
- With six, this episode has highest number of characters to appear in narration of Kamen Rider Build and (currently) overall Kamen Rider Series.

- The invention object of young Takumi Katsuragi is modified from the Modeling Support Goods toyline made by Kotobukiya.