|This article is about a/an episode in Kamen Rider Gaim.|
Shock! The Rival's Banana Transformation!? (衝撃！ライバルがバナナ変身!? Shōgeki! Raibaru ga Banana Henshin!?) is the third episode of Kamen Rider Gaim. It features the debut of Kamen Rider Baron and the Sakura Hurricane and Rose Attacker Lock Vehicles.
Kouta starts to gain a reputation in Inves Games by fighting them as Kamen Rider Gaim, when Kaito Kumon reveals he too has a Sengoku Driver and the Banana Lockseed.
A week has passed since Armored Rider Gaim debuted in the Inves Game and Team Gaim's popularity has since risen along with its rank. Meeting up with Mitsuzane Kureshima as he got out of Heaven's Tree Private High School, Kouta reveals he found his Team Gaim jacket with the intent to rejoin the group. Meeting up with rest of Team Gaim, Kouta reveals to Mai that he quit his jobs to help in Yuya's place. After assuring Mai that it will all work out, Team Gaim begins their performance before Kouta wins an Inves challenge by Team Raid Wild. This turn of events, with Team Gaim now in third place, rattles Kaito before he is contacted by Sid who offers him a means to make things more interesting in the Inves Game. Elsewhere, though he making money in the Inves Games, Kouta finds Akira disappointed with him as she could not accept money he earned from doing something that benefits him instead of the betterment of others. The next day, Kouta continues to ponder his thoughts on his sister's words before he finds himself being criticized by Kaito over his inability to properly use his power. This results in a challenge, with Kaito revealing he obtained his own Sengoku Driver and becomes the knight-like Armored Rider Baron. Intent to show what true power is all about, Baron is about attack when Sid steps in and deems a change of rules is needed while giving the Armored Riders Lock Vehicles so they can settle it in a race. However, the two end up in Helhiem Forest with Baron taking out an Inves and marvels at his new power.
- Kouta Kazuraba (葛葉 紘汰 Kazuraba Kōta): Gaku Sano (佐野 岳 Sano Gaku)
- Kaito Kumon (駆紋 戒斗 Kumon Kaito): Yutaka Kobayashi (小林 豊 Kobayashi Yutaka)
- Mitsuzane Kureshima (呉島 光実 Kureshima Mitsuzane): Mahiro Takasugi (高杉 真宙 Takasugi Mahiro)
- Mai Takatsukasa (高司 舞 Takatsukasa Mai): Yuumi Shida (志田 友美 Shida Yuumi)
- Chucky (チャッキー Chakkī): KANON
- Rica (リカ Rika): MIINA
- Rat (ラット Ratto): Ren Ozawa (小澤 廉 Ozawa Ren)
- Zack (ザック Zakku): Gaku Matsuda (松田 岳 Matsuda Gaku)
- Peko (ペコ Peko): Saku Momose (百瀬 朔 Momose Saku)
- Hideyasu Jonouchi (城之內 秀保 Jyonouchi Hideyasu): Ryō Matsuda (松田 凌 Matsuda Ryō)
- Ryoji Hase (初瀬 亮二 Hase Ryōji): Atsushi Shiramata (白又 敦 Shiramata Atsushi)
- Akira Kazuraba (葛葉 晶 Kazuraba Akira): Rika Izumi (泉 里香 Izumi Rika)
- Kiyojiro Bando (阪東 清治郎 Bandō Kiyojirō): Tomohisa Yuge (弓削 智久 Yuge Tomohisa)
- Lock Dealer Sid (錠前ディーラー シド Jōmae Dīrā Shido): Kazuki Namioka (波岡 一喜 Namioka Kazuki)
- DJ Sagara (DJサガラ Dī Jei Sagara): Tomomitsu Yamaguchi (山口 智充 Yamaguchi Tomomitsu)
- Sengoku Driver Equipment Voice (戦極ドライバー各種アイテム音声 Sengoku Doraibā Kanren Aitemu Onsei): Seiji Hiratoko (平床 政治 Hiratoko Seiji)
- Narration (ナレーション Narēshon): Hōchū Ōtsuka (大塚 芳忠 Ōtsuka Hōchū)
- Iyo (イヨ): Yui Natsuki (那月 結衣 Natsuki Yui)
- Students: Moe Sasaki (佐々木 萌詠 Sasaki Moe), Rino Nakajima (中嶋 理乃 Nakajima Rino), Yoshikazu Nishikawa (西川 喜一 Nishikawa Yoshikazu)
- Fan: Nobuaki Oka (岡 延明 Oka Nobuaki)
- Girls: Yoko Okuyama (奥山 洋交 Okuyama Yoko), Hazuki (葉月)
- Lock Used:
- Orange, Pine, Sakura Hurricane
- Banana, Rose Attacker
- Arms Change:
- Lock Vehicle:
- As part of Super Hero Time, this episode aired alongside Zyuden Sentai Kyoryuger episode 34 Brave 34: Resurrection! Bragigas Appears!.
- Viewership: 5.0%
- Closing Screen Lockseed Collection:
- When Kaito transformed into Baron for the first time, Zack screams "Banana!? Bana-Banana!?", followed by Kaito saying "Baron da!", meaning "it's Baron!". This scene was made as a running gag by both Zack and Kaito's actors in various stage shows whenever Yutaka Kobayashi was about to reenact Kaito's transformation scene.
- Kazuki Namioka's (Lock Dealer Sid) 35th birthday, falling on August 2nd 2013, was celebrated during filming of this episode. 
- TV Asahi's official summary for 「衝撃！ライバルがバナナ変身!?」
- Toei TV's official episode guide for 「衝撃！ライバルがバナナ変身!?」