Rider Great Assembly! Revealing the Mystery of the Forest!

Rider Great Assembly! Revealing the Mystery of the Forest! (ライダー大集結！森の謎を暴け！) is the tenth episode of Kamen Rider Gaim. It is the debut of Kamen Rider Ryugen's Kiwi Arms, as well as the debut of Takatora Kureshima's first on-screen transformation into Kamen Rider Zangetsu.

Synopsis
Kota and Mitsuzane begin to postulate on the identity of the white Armored Rider who seems to be destroying all evidence of the Inves entering their dimension. To try to figure out what should be done about both the Inves and the white Rider, Kota decides to consult with the other Armored Riders

Plot
Christmas is fast approaching and while doing a part time job, Kota finds two Inves attacking a woman and rescue her before finishing them. With the increasing incidents involving the Inves, Kota and Mitsuzane decide to investigate the Helheim Forest to look for clues, but they must beware of the white Armored Rider. Mitch then comes up with an idea, by inviting Kaito, Ryoji and Hideyasu for a game in the forest, with the team catching the most Lockseeds declared as the winner. As Team Gaim is the only team with two Riders, Kota agrees to sit out of the game, as his true intention is to have the other Riders distracting the white Rider and his minions while he looks for clues about the Inves and Yuya's whereabouts. To give Ryoji and Hideyasu access to the forest, the Riders convince Sid to provide them some Lockvehicles but he claims that he will have them ready by Christmas. Mai gets angry at Kota and Mitch for proposing such game just when Team Gaim is on top of the rankings but they calm her down, claiming that it is necessary for them to learn the truth about the Inves and they promise to will return in time for their Christmas party. On the day of the game, the Riders are about to start when Oren appears, convincing them to join after he reveals that he also possesses a Lockvehicle. However, once several Inves appear before them, Kamen Rider Baron runs ahead of the others to the forest to have an advantage, with Bravo following soon after. To delay Ryugen further, Kurokage and Gridon feed a Himawari Lockseed to an Inves to strengthen it and rush to the forest as well. With all other Riders away, Gaim appears to assist Ryugen who fights the Inves as the new Armored Rider Ryugen Kiwi Arms and instructs him to run after the others. Before leaving, Ryugen lends Gaim the Suika Lockseed to help him dispose of the enemies. Upon knowing of the Riders appearing at the Helheim Forest, Takatora transforms into Armored Rider Zangetsu as he is about to depart there as well.

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)
 * Hideyasu Jonouchi (城之內 秀保): Ryō Matsuda (松田 凌)
 * Ryoji Hase (初瀬 亮二): Atsushi Shiramata (白又 敦)
 * Ryoma Sengoku (戦極凌馬): Tsunenori Aoki (青木玄徳)
 * Oren Pierre Alfonzo (凰蓮・ピエール・アルフォンゾ): Metal Yoshida (吉田 メタル)
 * 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)
 * Sengoku Driver Voice (戦極ドライバー音声), Lockseed Voice (ロックシード音声): Seiji Hiratoko (平床 政治)
 * Narration (ナレーション): Hōchū Ōtsuka (大塚 芳忠)

Lockseeds

 * Lock Used:
 * Gaim:
 * Orange, Suika, Sakura
 * Baron:
 * Banana, Rose
 * Ryugen:
 * Budou, Kiwi, Rose
 * Zangetsu:
 * Melon
 * Gridon:
 * Donguri, Rose
 * Kurokage:
 * Matsubokkuri, Sakura
 * Bravo:
 * Durian, Sakura
 * Arms Change:
 * Gaim:
 * Orange Arms, Suika Arms
 * Baron:
 * Banana Arms
 * Ryugen:
 * Budou Arms, Kiwi Arms
 * Zangetsu:
 * Melon Arms
 * Gridon:
 * Donguri Arms
 * Kurokage:
 * Matsubokkuri Arms
 * Bravo:
 * Durian Arms
 * Lock Vehicle:
 * Gaim:
 * Sakura Hurricane
 * Baron:
 * Rose Attacker
 * Ryugen:
 * Rose Attacker
 * Gridon:
 * Rose Attacker
 * Kurokage:
 * Sakura Hurricane
 * Bravo:
 * Sakura Hurricane