2017: Grand Climax!

2017: Grand Climax! (2017：グランド・クライマックス！) is the fortieth episode of Kamen Rider Zi-O. It is the second part of the Kamen Rider Den-O tribute arc. It features Sougo's first full transformation into GrandZi-O and second battle between him and Oma Zi-O.

Synopsis
After obtaining the Den-O Ridewatch, the new GrandZi-O Ridewatch suddenly formed in Sougo's hands! A Ridewatch that contains the strongest of powers: the combined strength of all the past Heisei Riders! However, after Yuto Sakurai and Deneb intervened in the timeline, in order to prevent Sougo from becoming the demonic king of the future, the GrandZi-O Ridewatch disappeared! After returning to 9 5 Do, Sougo and the others realize that Takuya (Another Den-O) strongly wished for something, and once that wish is fulfilled, the contract with the Imagin will be complete, however...

Continuity and Placement

 * Kamen Rider Den-O: After the events of Kamen Rider Heisei Generations FOREVER.

Plot
to be added

Cast

 * Sougo Tokiwa (常磐 ソウゴ): So Okuno (奥野 壮)
 * Geiz Myokoin (明光院 ゲイツ): Gaku Oshida (押田 岳)
 * Tsukuyomi (ツクヨミ): Shieri Ohata (大幡 しえり)
 * Black Woz (黑ウォズ): Keisuke Watanabe (渡邊 圭祐)
 * Heure (ウール): Rihito Itagaki (板垣 李光人)
 * Ora (オーラ): Ayaka Konno (紺野 彩夏)
 * Swartz (スウォルツ): Kentaro Kanesaki (兼崎 健太郎)
 * Junichiro Tokiwa (常磐 順一郎): Katsuhisa Namase (生瀬 勝久)
 * Oma Zi-O (オーマジオウ), Ziku-Driver, Ridewatch Voices: Rikiya Koyama (小山 力也)
 * Ziku-Driver Voice: Yohei Onishi (大西 洋平)
 * BeyonDriver Voice: AFRO (アフロ)

Guest Cast

 * Yuto Sakurai (桜井 侑斗): Yuichi Nakamura (中村 優一)
 * Momotaros (モモタロス): Toshihiko Seki (関 俊彦)
 * Urataros (ウラタロス): Kōji Yusa (遊佐 浩二)
 * Kintaros (キンタロス): Masaki Terasoma (てらそま まさき)
 * Ryutaros (リュウタロス): Kenichi Suzumura (鈴村 健一)
 * Deneb (デネブ): Hōchū Ōtsuka (大塚 芳忠)
 * Takuya Endo (遠藤タクヤ): Dai Goto (後藤大)

Suit Actors

 * Kamen Rider Zi-O, Momotaros: Seiji Takaiwa (高岩 成二)
 * Kamen Rider Geiz: Yuya Nawata (縄田 雄哉)
 * Kamen Rider Woz, Urataros: Eitoku (永德)
 * Kamen Rider Zeronos, Deneb: Masashi Takada (高田 将司)
 * Kintaros: Jirō Okamoto (岡元 次郎)
 * Ryutaros: Toshihiro Ogura (おぐら としひろ)
 * Mole Imagin, New Mole Imagin: Kazuya Okada (岡田 和也)
 * Another Den-O: Jun Watanabe (渡辺 淳)

Ridewatches

 * Watch used:
 * Zi-O
 * Zi-O, GrandZi-O
 * Geiz
 * Geiz, GeizRevive
 * Rider Armor(s) used:
 * Zi-O
 * GrandZi-O
 * Geiz
 * GeizRevive Goretsu
 * Kamen Rider(s) summoned in Grand Zi-O:
 * to be determined

Miridewatches

 * Watch used:
 * Woz
 * Woz
 * Futurering(s) used:
 * Woz
 * to be determined

Other Form Changes

 * Den-O - Sword Form, Climax Form
 * Zeronos - Altair Form