|This article is about a/an episode in Kamen Rider OOO.|
The Grasshopper, the Father and Son, and the Ally of Justice (バッタと親子と正義の味方 Batta to Oyako to Seigi no Mikata) is the twenty-first episode of Kamen Rider OOO.
Uva uses the desires of a troubled father to serve justice for the sake of his son to create a Greeed that assist him in creating this desire.
As Chiyoko and others gather supplies to make Valentine's Day chocolate, Shintaro notices a boy being pushed around by an older man after he refuses to pick up a can he threw. After Eiji gives the man his can, the boy's father arrives and his son, Takashi, expresses pride in him in not letting bad guys have their way before Chiyoko recognizes the father as Susumu Kanbayashi. After leaving, and after Takashi runs away from him after seeing his father refusing to come back home to him and his mom, Susumu is confronted by Uva who creates a Yummy that acts on the man's subconscious desire to show that crime does not pay and molts into the Batta Yummy. Later at the Cous Coussier, while the others continue to prepare for Valentine's Day, Eiji is still worried at how Ankh was unable to regain his true form. Taking Ankh along with him on an errand, Eiji is unable to get any answers as Ankh senses the Yummy's presence. Upon seeing the Batta Yummy going after a frighten woman, Eiji becomes Kamen Rider OOO with several Waste Yummy getting in the way. After transforming into Takauba to destroy the monster grunts, he watches the Batta Yummy give the scared woman her purse before taking his leave. At the Cous Coussier, with Chiyoko tending to Susumu's wounds before he leaves off, Eiji and Ankh are confused as how the Yummy was acting heroic, but Ankh chides the Eiji for thinking a Yummy can truly be a hero. Later, as the Batta Yummy resumes his attack on whomever Susumu sees as a bad guy, Shintaro trains to resist the Birth Buster's recoil before finding Takashi and tries to explain to him about not putting himself in danger before the boy runs off. That night, when the Batta Yummy attacks a group of punks for causing noise pollution, Eiji arrives and becomes OOO to stop the monster's rampage. With no suitable Core Medals to counter the monster's speed, Ankh is forced to give OOO his Kujaku Medal to become Takajaba before the Batta Yummy stops the escaping punks from nearly running Takashi over. By then, Date arrives and becomes Kamen Rider Birth, using the Caterpillar Leg and Shovel Arm to take some Cell Medals before Uva intervenes. With OOO arriving in time, the Kamen Riders fight Uva and the Batta Yummy. But just as OOO prepares to use a Giga Scan to destroy the Batta Yummy, Susumu stands in the line of fire. Seeing that his father unable to give up this new power to do good, Takashi follows suit in protecting him from the astonished Kamen Rider.
- Medals Used:
- Head - Taka
- Arms - Tora, Unagi, Kujaku
- Legs - Batta
- Combos Used:
- Tatoba Combo, Takauba, Takajaba
- Eiji Hino (火野 映司 Hino Eiji): Shu Watanabe (渡部 秀 Watanabe Shū)
- Ankh/Shingo Izumi (アンク／泉 信吾 Anku/Izumi Shingo): Ryosuke Miura (三浦 涼介 Miura Ryōsuke)
- Hina Izumi (泉 比奈 Izumi Hina): Riho Takada (高田 里穂 Takada Riho)
- Shintaro Goto (後藤 慎太郎 Gotō Shintarō): Asaya Kimijima (君嶋 麻耶 Kimijima Asaya)
- Erika Satonaka (里中 エリカ Satonaka Erika): Mayuko Arisue (有末 麻祐子 Arisue Mayuko)
- Chiyoko Shiraishi (白石 千世子 Shiraishi Chiyoko): Marie Kai (甲斐 まり恵 Kai Marie)
- Kousei Kougami (鴻上 光生 Kōgami Kōsei): Takashi Ukaji (宇梶 剛士 Ukaji Takashi)
- Akira Date (伊達 明 Date Akira): Hiroaki Iwanaga (岩永 洋昭 Iwanaga Hiroaki)
- Uva (ウヴァ): Yūsuke Yamada (山田 悠介 Yamada Yūsuke)
- Susumu Kanbayashi (神林 進 Kanbayashi Susumu): Mitsunori Isaki (伊崎 充則 Isaki Mitsunori)
- Batta Yummy (バッタヤミー Batta Yamī, Voice): Daisuke Endō (遠藤 大輔 Endō Daisuke)
- Takashi Kanbayashi (神林 隆 Kanbayashi Takashi): Ryoga Nakanishi (中西 龍雅 Nakanishi Ryoga)
- Emi Kanbayashi (神林 恵美 Kanbayashi Emi): Misato Tate (建 みさと Tate Misato)
- Man who drop the can: Baban Baba (馬場 場番 Baba Baban)
- Thief: Masato Tsutamune (蔦宗 正人 Tsutamune Masato)
- Woman: Nanaru Minami (南 ななる Minami Nanaru)
- Young Man: Akinori Iwasawa (岩澤 晶範 Iwasawa Akinori), Wataru Ikeda (池田 わたる Ikeda Wataru)
- As part of Super Hero Time, this episode aired alongside Tensou Sentai Goseiger episode 50, Epic 50: Protecting the Planet is an Angel's Duty, the final episode of the series. Starting from February 13, 2011 onwards, OOO would air alongside Kaizoku Sentai Gokaiger.
- Viewership: 7.2%
- OOO's Core Medal Collection
- First time for OOO using Kujaku Arms on a Random Combo.
- This is the first episode of the Kamen Rider franchise to be written by Nobuhiro Mouri.
Kamen Rider OOO Volume 6 features episodes 21-24: The Grasshopper, Father and Son, and the Ally of Justice, Chocolate, Faith, and the Power of Justice, Beauty, an Egg, and the Sleeping Desire and Memories, Love, and the Marine Combo.