Birth! The Third Rider is Grapes!

Birth! The Third Rider is Grapes! (誕生！3人目のぶどうライダー！) is the fourth episode of Kamen Rider Gaim. It is the debut of Kamen Rider Ryugen.

Synopsis
Kota and Kaito work together to try to find Yuya, but they instead face off against an even more terrible enemy.

Plot
Finding themselves in Helhiem Forest, Kota reveals to Kaito that he has been in the dimension before. With the knowledge that are unripen Lockseeds in the area, Kaito wanders off to get some before returning to his world. Kota decides to use this time to find Yuya, but instead finds some researchers before getting into a fight with a terrible enemy: A white Armored Rider. Defeating a Shika Inves, Armored Rider Gaim is overpowered by the white Armored Rider named Kamen Rider Zangetsu, convincing him that his Sengoku Driver was forbidden. The next day, after returning from Helhiem Forest with high class Lockseeds as bargaining chips, Kaito calls Team Raid Wild's Ryoji Hase and Team Invitto's Hideyasu Jonouchi to set up an alliance among their groups to take out Team Gaim. At that time, Mai and Mitsuzane are called by Akira to check up on Kota who tells them of his near death experience with the mysterious Armored Rider and that he is giving up being an Armored Rider. Taking the Sengoku Driver to Team Gaim's garage, Mai tells Mitsuzane of her experience in Helhiem Forest and that they can not rely on Kota anymore for his own good. But confident that Kouta will return, Mitsuzane meets up with Sid the following day and uses his status as a member of the Kureshima family to convince the dealer to provide him with a Sengoku Driver. When Team Invitto arrives to Team Gaim's stage with an Ichigo Lockseed, understanding the protecting others means risking his own well being, Mitsuzane reveals his new Sengoku Driver and uses the Budou Lockseed to transform into an Armored Rider.

Cast

 * Kota Kazuraba (葛葉 紘汰): Gaku Sano (佐野 岳)
 * Kaito Kumon (駆紋 戒斗): Yutaka Kobayashi (小林 豊)
 * Mitsuzane Kureshima (呉島 光実): Mahiro Takasugi (高杉 真宙)
 * Mai Takatsukasa (高司 舞): Yuumi Shida (志田 友美)
 * Takatora Kureshima (呉島 貴虎): Yuki Kubota (久保田 悠来)
 * Chucky (チャッキー): KANON
 * Rica (リカ): MIINA
 * Rat (ラット): Ren Ozawa (小澤 廉)
 * Zack (ザック): Gaku Matsuda (松田 岳)
 * Peco (ペコ): Saku Momose (百瀬 朔)
 * Hideyasu Jonouchi (城之內 秀保): Ryō Matsuda (松田 凌)
 * Ryoji Hase (初瀬 亮二): Atsushi Shiramata (白又 敦)
 * Akira Kazuraba (葛葉 晶): Rika Izumi (泉 里香)
 * Lock Dealer Sid (錠前ディーラー　シド): Kazuki Namioka (波岡 一喜)
 * DJ Sagara (DJサガラ): Tomomitsu Yamaguchi (山口 智充)
 * Narration (ナレーション), Sengoku Driver Voice (戦極ドライバー音声), Lockseed Voice (ロックシード音声): Hōchū Ōtsuka (大塚 芳忠)

Suit actors

 * Kamen Rider Gaim: Seiji Takaiwa (高岩 成二)
 * Kamen Rider Baron: Eitoku (永徳)
 * Kamen Rider Ryugen: Daisuke Satō (佐藤 太輔)
 * Kamen Rider Zangetsu: Jun Watanabe (渡辺 淳)

Lockseeds

 * Lock Used:
 * Gaim:
 * Orange, Pine
 * Baron:
 * Banana, Rose Attacker
 * Zangetsu:
 * Melon
 * Ryugen:
 * Budou
 * Other:
 * Ichigo
 * Arms Change:
 * Gaim
 * Orange Arms, Pine Arms
 * Baron
 * Banana Arms
 * Zangetsu
 * Melon Arms
 * Ryugen
 * Budou Arms