Kamen Rider Zi-O: Over Quartzer

Kamen Rider Zi-O: Over Quartzer (劇場版 仮面ライダージオウ Over Quartzer（オーヴァー クォーツァー）) is the Summer film adaptation of Kamen Rider Zi-O. It was released on July 26, 2019, double-billed with , while serving as a tribute to Kamen Rider Drive, as well as the Heisei era period of Kamen Rider. In the film, Sougo comes face-to-face with the Quartzers, who intend to wipe Kamen Rider Drive from history and conspire against his kingship.

The catchphrases for the movie are "The Final Chapter of Heisei Kamen Riders" (平成仮面ライダー、最終章.) and "Break through the Eras, Change the Future." (時代を壊せ、未来を変えろ.).

The film was released on Blu-ray and DVD on January 8, 2020.

Synopsis
The Quartzers, calling themselves the Wardens of Time, appear after Sougo Tokiwa collected all of the Heisei Ridewatches. A grand conspiracy behind the birth of the King of Time becomes clear...

Continuity and Placement

 * Kamen Rider Zi-O:The movie is confirmed to be canon by producer Shinichiro Shirakura on Twitter However, its placement in the timeline is difficult to determine.
 * The movie takes place at least after episode 43 for the presence of GrandZi-O.
 * The Drive Ridewatch is collected in this movie as per the main plot, which Sougo didn't have at least till the first-half of episode 44. Also, in episode 47, Geiz recognized Chase and mentioned Go Shijima. But the movie cannot be fit in as of the finale arc episodes are tightly packed together.
 * However, these inconsistencies could be due to the Quartzer altering the timeline at the end of the movie or due to Swartz's space-time disturbances.
 * Kamen Rider Zero-One: The post-credits scene must take place after the events of Kamen Rider: Reiwa The First Generation, as Zero-One is aware of his status as the first Reiwa-era Rider. More specifically, this event takes place after episode 16, as Zero-One is also in possession of the Flying Falcon key, which was previously stolen by Jin.
 * However, presence of Robo Rider Ridewatch lying on the road suggests that the scene must take place immediately after the battle and Zero-One's appearance was a time-travel.

Plot
Sougo Tokiwa has a dream of seeing a yellow Rider with a grasshopper motif. He wakes up in a panic, claiming that Zi-O had disappeared in his dream and the new Rider had taken his place.

Soon afterwards, Sougo, Geiz, Tsukuyomi and Woz receive a call from Krim Steinbelt. He asks them to protect his ancestor, who is currently threatened by an unknown enemy, claiming that if his ancestor perished, so does he, and the history of Kamen Rider Drive will disappear as result.

Sougo and his friends go to 1575, in the Sengoku period. There, they meet Oda Nobunaga, the revered demon king. But instead, Nobunaga is a weak-willed lecher. Nobunaga tries to court a foreign woman named Clara Steinbelt, Krim's ancestor. So, they must protect the woman.

Suddenly, the enemy appears in the form of Kagen (Kamen Rider Zonjis) and Jogen (Kamen Rider Zamonas). As Sougo and his friends fight them, Go Shijima arrives from the future to assist. After successfully repelling the enemies, Go tells them the history of Kamen Rider Drive.

Later, a war breaks out. As Nobunaga is too scared to lead his army, Geiz took his place instead. Zamonas and Zonjis also appear in the midst of the enemy's army, they brought out Time Mazines too. Sougo, Woz and Go fight them and win. After that, they come back to 2019, Krim and Go hand Sougo the Drive and Mach Ridewatches respectively. With that, all 20 Heisei Ridewatches are collected.

Suddenly Woz stole all the Ridewatches. When the rest confront him, he summons a platform full of people with the same outfit as him, and introduce themselves as the Quartzer. They're the controllers of history, with the leader, SOUGO Tokiwa himself. SOUGO claims to be the true king of time, manipulating Sougo's journey all along from the shadows, including using his special powers to make Swartz think that Sougo was the chosen one, while he originally was just a normal student. He transforms into Kamen Rider Barlckxs and defeats Sougo in his GrandZi-O form, capturing him.

In prison, Sougo asks why Woz betrayed him. The prophet of the future answers that his loyalty is always to Sougo, the leader of Quartzer from the Original Timeline. An enraged Geiz attacks Woz and they fight fiercely, but it's a distraction while Tsukuyomi and Go release Sougo.

Sougo faces Barlckxs again, but he's easily defeated once more as Barlckxs claims that the power of the Heisei era can't affect him. In the middle of the city, SOUGO declares his true goal: through the Ridewatches he'd unify the Heisei era which was broken in unconnected and unfitting settings, rebuilding everything in a unified world view under his control. With the Dai Mazines activating, a singularity is created and everything from the Heisei era in the current world starts being absorbed into it as the first step before the birth of his new world, and even Sougo is pulled towards it.

However, after losing consciouness, Sougo wakes up in a strange dimension instead. He saw past memories of him as a kid playing with his parents. His younger self declares that he'll become a king in the future. It turns out to be an illusion as Sougo suddenly appeared in a deserted wasteland, in 2068. In there, he is greeted by Ohma Zi-O himself. The future demon king explains that SOUGO's claims are true, and Sougo was never born to be king. In spite of that, his dream leads Sougo to become Ohma Zi-O. Sougo chooses to embrace his dream, even if he wasn't born to do it. Sougo suddenly wakes up back in the present, declaring that he wants to be king to help the world, when the Ohma Zi-O Ridewatch materialized. Sougo transforms into Zi-O Ohma Form as a gigantic projection of Ohma Zi-O appeared behind him. Witnessing this, Woz makes a grand speech about Zi-O Ohma Form being the advent of a new history that wasn't in his book. Finally, Zi-O landed in front of Zonjis and Zamonas.

Zi-O Ohma Form's arrival is followed by Go Shijima recovering his powers and all main Heisei Riders reappear to join the battle against the Quartzers. Riders also start materializing even from games (The Goriders), theater posters (Kamen Rider Zangetsu Kachidoki) and manga (Kuuga). They all help fight the army of Kasshines that appeared across the city. Witnessing Sougo’s quality as the one true king, Woz renounces his Quartzer membership in front of SOUGO before he tears his Oma Advent Calendar apart, stating that history is not set in stone, and that he belonged to the Heisei Riders. With the destruction of his beloved book, the pages fly into space and alters the portal functions. The Dai-Mazines that appeared in space lost their power source and fell like meteors and all 19 previous Heisei Kamen Riders proceed to go to their final forms.

Just as Woz revels in the Heisei Riders victory, Barlckxs throws his Revolcane and fatally wounded Woz. Geiz then appeared to support Woz and declared for everyone to stand with their True King. Witnessing Zi-O Ohma Form gallantly battling with Barlckxs and succeeded in destroying the remaining Dai Mazines, Woz passed away. The Heisei Riders also successfully defeat Zonjis and Zamonas. Cornered, Barlckxs then uses Kamen Rider Black RX BioRider and J's Ridewatch to transform into a liquefied giant and attacking all Heisei Riders present. However, Sougo remains defiant. He, with all Heisei Riders then use their combined Rider Kicks and penetrated Barlckxs last shield (a gigantic, liquefied board), dealing the finishing blow. In disbelief, Barlckxs shows the damaged board, now imprinted with Heisei in Kanji before exploding, killing the Leader of Quartzer for good.

With the defeat of Barlckxs, Geiz and Tsukuyomi disappeared because the future is now unknown. In spite of that, they're happy because it means they accomplished their mission. The other Quartzer reappear before Sougo Tokiwa, asking if he is fine with the world as it is, disjointed and lacking unity, and he replies that he is fine with it because life is like that. They tell him they're interested in seeing how his future will turn out. When returning home, Geiz, Tsukuyomi and Woz are mysteriously restored, waiting for him.

Post-Credits Scene

Back in the scene of the battle, Kamen Rider Zonjis has recovered. He claims to be the one who will rule over the Reiwa era. However, the Rider from Sougo's dream, Kamen Rider Zero-One appears and announces he is the first Kamen Rider of the Reiwa era. Zero-One fends off the Kasshines and defeats Zonjis using Flying Falcon, putting an end to his ambitions.

Allies

 * Tsukuyomi
 * Oda Nobunaga
 * Gyuzo
 * Clara Steinbelt
 * Pietro

Quartzer

 * Kasshine

Other

 * Swartz (flashback)

Main 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)
 * Woz (ウォズ): Keisuke Watanabe (渡邊 圭祐)
 * Junichiro Tokiwa (常磐 順一郎): Katsuhisa Namase (生瀬 勝久)
 * Ziku-Driver, Ridewatch, Ohma Zi-O Voices: Rikiya Koyama (小山 力也)
 * Ziku-Driver Voice: Yohei Onishi (大西 洋平)
 * BeyonDriver Voice: AFRO (アフロ)

Guest Cast

 * SOUGO Tokiwa (常磐 SOUGO (ソウゴ)): ISSA
 * Kagen (カゲン): Papaya Suzuki (パパイヤ鈴木)
 * Jogen (ジョウゲン): Syuusuke Saito (斉藤 秀翼)
 * Oda Nobunaga (織田 信長): Tomoya Maeno (前野朋哉)
 * Gyuzo (牛三): Jiei Wakabayashi (若林時英)
 * Clara Steinbelt (クララ・スタインベルト): Eru Aoba (蒼葉える)
 * Takeshi Kinashi (木梨猛): Noritake Kinashi (木梨憲武)
 * Sotaro Tokiwa (常磐 宗太郎): Keizo Nagashima (永島敬三)
 * Namie Tokiwa (常磐 奈美恵): Shoko Imayoshi (今吉 祥子)
 * Pietro (ピエトロ): Caleb Bryant
 * Quartzer Member: DA PUMP (YORI, TOMO, KIMI, U-YEAH, KENZO, DAICHI)
 * Sougo Tokiwa (Child): Haru Takagi (高木波瑠)
 * Kamen Rider Zero-One (仮面ライダーゼロワン): Fumiya Takahashi (高橋文哉)

Returning Cast

 * Go Shijima (詩島 剛): Yu Inaba (稲葉 友)
 * Krim Steinbelt (クリム・スタインベルト): Chris Peppler (クリス・ペプラー)

Ridewatches

 * Watch used:
 * Zi-O
 * Zi-O, Zi-O Ridewatch II, GrandZi-O, Ohma Zi-O
 * Geiz
 * Geiz, GeizRevive
 * Barlckxs
 * Barlckxs, Bio Rider, J
 * Zonjis
 * Zonjis, Robo Rider
 * Zamonas
 * Zamonas
 * Rider Armor(s) used:
 * Zi-O
 * Zi-O II, GrandZi-O, Ohma Form
 * Geiz
 * GeizRevive Shippu, GeizRevive Goretsu
 * Kamen Rider(s) summoned in GrandZi-O:
 * Ryuki, Faiz, Den-O Sword Form, Kiva, Double CycloneJoker, Gaim Orange Arms, Drive Type Speed
 * Weapon(s) summoned in GrandZi-O/Zi-O Ohma Form:
 * Saikyo Zikan Girade

Miridewatches

 * Watch used:
 * Woz
 * Woz, Ginga, Shinobi
 * Futurering(s) used:
 * Woz
 * Woz GingaWakusei, Futurering Shinobi

Signal Bikes

 * Bike Used:
 * Form Change: Signal Mach
 * Signal Exchange: N/A
 * Form Used:
 * Mach

Advent Cards

 * Cards used
 * Ryuki:
 * Sword Vent, Dragreder, Survive Rekka
 * Weapons/Powers summoned:
 * Ryuki:
 * Drag Saber, Drag-Visor Zwei

Fuestles

 * Fuestle Used:
 * Doran Fuestle, Tatsulot Fuestle
 * Forms Used:
 * Kiva, Emperor

Rider Cards

 * Card Used:
 * Kamen Rider Decade:
 * Kamen Ride: Decade
 * Attack Ride: N/A
 * Form Ride: N/A
 * Final Form Ride: N/A
 * Final Attack Ride: N/A
 * Final Kamen Ride: Decade Complete
 * K-Touch: N/A
 * Forms:
 * Complete Form

Gaia Memories

 * Memory Used:
 * Soul - Cyclone, Xtreme
 * Body - Joker, Xtreme
 * Half Changes:
 * CycloneJoker, CycloneJokerXtreme

O Medals

 * Medal Used:
 * Head - Taka, Ptera
 * Arms - Tora, Tricera
 * Legs - Batta, Tyranno
 * Combo Changes:
 * Tatoba Combo, Putotyra Combo

Astroswitches

 * Astroswitch Used:
 * Circle - Rocket, Cosmic
 * Cross - Launcher
 * Triangle - Drill
 * Square - Radar
 * States Used:
 * Base States, Cosmic States

Wizard Rings

 * Wizard Ring Used:
 * Flame, Dragorise, Infinity
 * Style Changes:
 * Flame Style, Infinity Style

Lockseeds

 * Lock Used:
 * Gaim
 * Orange, Kachidoki, Kiwami
 * Zangetsu
 * Kachidoki
 * Arms Change:
 * Gaim
 * Orange Arms, Kiwami Arms
 * Zangetsu
 * Kachidoki Arms
 * Weapons summoned in Kiwami Arms:
 * to be determined
 * Weapon Used:
 * Zangetsu
 * Hinawa Tenga DJ-Ju (Taiken Mode), Kachidoki Flag (Bata)

Shift Cars

 * Car Used:
 * Drive
 * Type Change: Shift Speed, Shift Tridoron
 * Tire Exchange: N/A
 * Type Used:
 * Type Speed, Type Tridoron
 * Tire Blending used in Type Tridoron:
 * N/A

Eyecons

 * Eyecon Used:
 * Ore, Mugen
 * Damashii Used:
 * Ore Damashii, Mugen Damashii

Rider Gashats

 * Gashat Used:
 * Ex-Aid
 * Mighty Action X, Maximum Mighty X, Hyper Muteki
 * Level Used:
 * Ex-Aid
 * Action Gamer Level 2, Muteki Gamer

Fullbottles

 * Bottle used:
 * Biotic: Rabbit
 * Abiotic: Tank
 * Other: Genius
 * Form(s) used:
 * RabbitTank Form, Genius Form

Progrise Keys

 * Key Used:
 * Rising Hopper, Flying Falcon
 * Form Used:
 * Rising Hopper, Flying Falcon

Theme song

 * P.A.R.T.Y. ~Universe Festival~, by DA PUMP

International Releases
The film saw its first international release in Thailand for a limited time starting on August 31, 2019, with both a Thai dub and the original Japanese-language showing with Thai subtitles.

The film was also released in Malaysia on October 19, 2019, available with both a Malaysian dub and the original Japanese-language with Malaysian subtitles.

The film was also released in Singapore on November 23, 2019.

The film was also released in Hong Kong on November 28, 2019, available in the original Japanese-language with Cantonese subtitles. It was also released in Taiwan on December 13, 2019, available in Japanese language with Traditional Chinese subtitles.

The film also began streaming in mainland China on Tencent Video starting on January 8, 2020. An opening night ceremony for the film was held on December 21 in Shanghai prior to the release.

Errors

 * When Jogen activates his Ridewatch, the Anotherwatch activation sound is played instead of the standard Ridewatch sound.
 * When GrandZi-O fighting with Barlckxs, a "Kabuto" sound is played, however there is no sign for Kabuto being summoned.
 * Instead of inserting Rider Pass into DenKamen Sword, Den-O accessed Liner Form by dialing K-Taros, a method used for accessing Climax Form by Imagin.

Deleted Footages

 * In the original footage, Kikaider 01 was introduced by Woz in front of the civilians, however, this scene was cut out from the movie and was replaced by Kamen Rider Zero-One and new footage.
 * This shooting was likely intentional misdirect by the producers and crew as a means to hide the reveal of Kamen Rider Zero-One from the extras who appeared during film.
 * Barlckxs vs. Zi-O Ohma Form in sword fight.