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Mitsuaki Gamou, also known as the Sagittarius Zodiarts, is the chairman of the Amanogawa High School School Board and the main antagonist of Kamen Rider Fourze. He is the leader of the Horoscopes and the one who is responsible for the distribution of the Zodiarts Switches in order to find users for all twelve Horoscope Switches. Once all twelve Horoscope Switches have users, Gamou will be able to complete the Day of the Awakening and make contact with the Presenters.

He was portrayed by Shingo Tsurumi.



Young Gamou looked up at the star.

During the summer of 1969, in conjunction with Apollo 11 beginning its exploration, Gamou made contact with a mysterious alien race called the Presenters and promised to meet them someday. Gamou later became an astronaut in OTSO and researched the powers of Cosmic Energy with his colleagues Rokuro Utahoshi and Kuniteru Emoto.

20 years prior to the series, Gamou and Rokuro discovered the Core Switch created by the Presenters and began working to reverse engineering the Core Switch. However, the two undertook very different routes from each other in this process, with Gamou creating the Cosmic Switch as the basis for a system that would forcefully evolve the human body in seconds to be able to withstand space while Rokuro researched a safe transwarp system which would take years after he was dead to be complete. Their differing ideas would lead to their friendship withering and eventually, three years after finishing the Switches, Gamou had Emoto steal the Zodiarts Switches from Utahoshi before the OSTO Space Station exploded.

10years prior to the series, with funding from Foundation X, Gamou built Amanogawa High School directly under an atmospheric vortex known as The Hole, using the conditions to create the twelve Horoscopes switches so he could execute the Day of Awakening to reach the Presenters at the cost of the Earth's destruction.

Kamen Rider Fourze

Gamou observed from the background as Libra Zodiarts, Kouhei Hayami and Scorpio Zodiarts distributed Zodiarts Switches to the students of AGHS. After Sarina Sonoda, the Scorpio Zodiarts, failed to defeat Fourze as Scorpio Nova, Gamou confiscated her Zodiarts Switch, but gave it back to her after she convinced him to give her a second chance. However, after Sonoda was defeated again by Kamen Rider Meteor and almost had her identity uncovered, Gamou tells her she is of no more use to him and has Virgo Zodiarts banish her to the Dark Nebula. Gamou later has her disappearance covered up saying she had to leave due to health problems.

After Kouhei Hayami/Libra Zodiarts was defeated by Fourze, Gamou was prepared to have Virgo banish him to the Dark Nebula, but stayed his hand when the principal manifested the Eye of Laplace ability. Gamou ordered him to seek out the remaining Horoscopes so the timetable for their further plans could be accelerated.

After Tomoko was sent into the Dark Nebula, Emoto told Gamou he would deal with the rest of the Kamen Rider Club once they had served their purpose. Gamou then transformed into the Sagittarius Zodiarts to the awe of his subordinates and proclaimed he would eliminate the group should they fail. After discovering that Emoto had been providing assistance to the Kamen Rider Club as Tachibana, Gamou transforms into Sagittarius and fatally wounds him as well as overpowering Fourze and Meteor. Returning to his lair, Gamou laments losing his last true friend.

Gamou later recruited Dark Yuki as the Gemini Zodiarts, sensing a kindred spirit within her as Yuki had also heard the Presenters calling to her. Following Dark Yuki's destruction, Gamou began to suspect that Kengo was the holder of the Core Switch.

After Ran Kuroki was identified by Hayami as the final Horoscope, Gamou revealed himself to the Kamen Rider Club and formulated a plan with Hayami to get Ran to use to Horoscopes Switch by having Hayami fake a defection. The plan succeeded and with all twelve Horoscopes found, Gamou prepares to execute the Day of Awakening. However, Gamou discovers that while it is happening he is open to attack. Fourze attempts to defeat Gamou with a Super Galaxy Finish, but Hayami blocks the attack and is killed instead.

However, Kengo's Core Child powers fully manifest and render Gamou unable to use the Horoscopes Switches. After having Leo to attack the Rabbit Hatch to lure out Kengo, Gamou destroys the Core Switch sustaining Kengo's life, resulting in the death of the Core Child.

After announcing the end to the entire school on the first day of the spring semester, Sagittarius Nova has a final confrontation with Kamen Rider Fourze. Sagittarius Nova fights Fourze in his various forms before their fight leads them to the school gym where the Kamen Rider Club members hold a "graduation ceremony". Sagittarius Nova is finally defeated by Fourze's Youthful Galaxy Great Great Great Drill Kick attack. As Gamou's body begins to dissolve into stardust, Gamou finally accepts Gentaro's friendship and asks Gentaro to take his place in meeting the Presenters. Gamou then uses the Aquarius Switch to recreate the Core Switch and revive Kengo. Gamou apologizes to the Presenters that he could not keep his promise but tells them that his students will come to them in his stead before evaporating in a plume of red Cosmic Energy.

Kamen Rider × Super Sentai × Space Sheriff: Super Hero Taisen Z

The Sagittarius Zodiarts was one of the revived monsters in the Space Shocker army. During the battle against the combined army of Kamen Riders, Super Sentai teams and Space Sheriffs as they approached the Genmu Castle, Sagittarius was seen fighting Gokai Red.

Super Hero Taisen GP Kamen Rider 3

In the alternate timeline caused by by Shocker rewriting history with their History Modifying Machine, Sagittarius Nova was among the many monsters that served the evil organization after it achieved global dominion. During the final battle against the Kamen Riders, Sagittarius Nova initially faces Fourze. However, after he is erased by the Rider Robo, Sagittarius fights Zeronos instead and is destroyed by Zeronos Zero Form's Full Charge.

Kamen Rider Zi-O

An A.R. World version of Sagittarius Zodiarts is among five villain leaders summoned by Swartz in the final battle, alongside GamedeusUtopia DopantN-Daguva-Zeba and Evolt.



           Fourze Logo.png Villains

Horoscopes: Sagittarius Zodiarts | Virgo Zodiarts | Libra Zodiarts | Leo Zodiarts | Scorpion Zodiarts | Cancer Zodiarts | Aries Zodiarts | Capricorn Zodiarts | Aquarius Zodiarts | Taurus Zodiarts | Gemini Zodiarts | Pisces Zodiarts
Other Zodiarts: Orion Zodiarts | Chamelon Zodiarts | Unicorn Zodiarts | Hound Zodiarts | Altar Zodiarts | Pyxis Zodiarts | Perseus Zodiarts | Canis Minor Zodiarts | Lynx Zodiarts | Dragon Zodiarts | Pegasus Zodiarts | Cygnus Zodiarts | Coma Zodiarts | Musca Zodiarts | Lepus Zodiarts | Lyra Zodiarts | Hercules Zodiarts
Others: Stardust Ninja Dustards

Foundation X
Lem Kannagi | Katal | Solaris | Kiima | Masquerade Dopants | Waste Yummies | Stardust Ninja Dustards
Dummy Inhumanoids: Terror Dopant | Claydoll Dopant | R Nasca Dopant | Smilodon Dopant | Uva | Kazari | Gamel | Mezool

Space Ironmen Kyodain
Groundain | Skydain

Monster League
Saburo Kazeta | Rumi Komaki | Daita Kondou | Chikao Nezu

Xatan | Eel | Gahra

           Zi-O Logo.png Villains

Time Jackers
Swartz | Uhr | Ora | Tid | Finis

Another Riders
Another Build | Another Ex-Aid | Another Fourze | Another Faiz | Another Wizard | Another OOO | Another Double | Another Den-O | Another Kuuga | Another Gaim | Another Ghost | Another Shinobi | Another Quiz | Another Ryuga | Another Kikai | Another Zi-O | Another Blade | Another Agito | Another Ryuki | Another Hibiki | Another Kiva | Another Kabuto | Another Den-O II | Another Drive | Another Decade | Another Zero-One | Another 1 | Another Diend

Oma Zi-O's Army
Oma Zi-O | Woz | Kasshin | Dai Mazines

Future Riders
White Woz | Kamen Rider Ginga

Legendary Riders
Masato Kusaka | Kaito Kumon | Tsukasa Kadoya | Hajime Aikawa | Daiki Kaito | Shun Kageyama | Katsumi Daido

Another World Riders
Kamen Rider G4 | Kamen Rider Fuma | Kamen Rider Dark Ghost | Kamen Rider Rey | Kamen Rider Eternal | Kamen Rider Woz | Kamen Rider Yuuki

Kamen Rider Barlckxs | Kagen | Jogen | Woz | Kasshin | Dai Mazines

Tid's Army
Masquerade Dopants | Waste Yummies | Stardust Ninja Dustards | Elementary Inves | Ghouls | Lost Number Roidmudes | Gamma Commandos | Guardians | Hard Guardians

Swartz's Army
Monsters: Strong Smash Hazard | Mashin Chaser | Elementary Inves | Orion Zodiarts | Shika Inves | Utopia Dopant | N-Daguva-Zeba | Sagittarius Zodiarts | Gamedeus | Kamen Rider Evol
Footsoldiers: Guardians | Masquerade Dopants | Elementary Inves | Lost Number Roidmudes | Ghouls | Gamma Commandos | Bugster Virus

Salis Worms | Gryllus Worm | Imposter Shun Kageyama

Waste Yummies | Gamma Commandos | Humanoise | Mole Imagin | Narutaki

Rider Time Shinobi
Niji no Hebi
Yaminin | Stardust Ninja Dustards

Rider Time Ryuki
Tatsuya Kano | Takeshi Asakura | Jun Shibaura | Dark Shinji | Ishihashi | Tozuka | Kamen Rider Odin

           SHT Logo.pngVillains

Shocker-Zangyack Alliance
Leader: Narutaki/Doktor G
Commanders: Apollo Geist | General Shadow | General Jark | General Black | Shadow Moon | Doras | N-Daguva-Zeba | El of the Ground | Orphnoch King | Joker Undead | Nurikabe | Gryllus Worm | Bat Fangire | Alligator Imagin | Llumu Qhimil | Weather Dopant | Mezool
Kaijin: Scorpion Man | Ghoster | Isogin Jaguar | KomaThunder | Tiger-Roid | Cyborg Soldier Level 2 | Go-Gadoru-Ba | Go-Baberu-Da | Me-Garima-Ba | Go-Jaaza-Gi | Pantheras Luteus | Stellio Dextera | Brobajell | GuldMirage | Armadillo Orphnoch | Rhinoceros Beetle Orphnoch | Shell Undead | Tortoise Undead | Kasha | Musca Worm | Gecko Imagin | Bat Imagin | Mole Imagin | Medusa Legendorga | Warthog Fangire | Taurus Ballista | Cockroach Dopant | Spider Dopant | Kuwagata Yummy | Uni-Armadillo Yummy
Footsoldiers: Shocker Combatmen | Destron Combatmen | Dogma Fighters | Chaps

Leader: Rider Hunter Silva
Commanders: Black Cross King | Hades God Cyclops | Hades God Drake | Hades God Sleipnir | Hades God Dagon | Yaiba of Darkness | Gai | Rei | Sea Fist Demon Rageku | Sanyo | Suugu | Long | Miranda | Rairaiken | Yogoshimacritein | Pollution President Batcheed | Doukoku Chimatsuri | Dereputa of the Meteor | Mons Drake of the Planet | Brajira of the Messiah | Deratsueigar | Zatsurig | Warz Gill | Ackdos Gill
Monsters: Shikabanen | Zodomas | Buramudo | Nanonanoda | Bowser | Yokubarido | Stargull | Almadon | Uorlian | Daiyarl | Shieldon | Vannain | Namono-Gatari of the Ortaurus Headder | Bari-Boru-Dara of the Uniberus Headder | Rō-O-Zā-Ri of the Hydrapan Headder | Chinomanako | Nunchuck Banki
Footsoldiers: Gormin | Sugormin | Dogormin

Space Crime Syndicate Madou
Space Shocker
Leader: Shadow Moon
Commanders: Space Ikadevil | Space Spider Man
Kaijin: Scorpion Man | Saboteguron | Ghoster | Zanjioh | Jaguarman | Girizames | Schwarian | Zu-Zain-Da | Sonorabuma | Buzzstinger Wasp | Arch Orphnoch | Tortoise Undead | Gecko Imagin | Pearlshell Fangire (Blue) | Bat Fangire | Beetle Fangire | Bat Dopant | Beast Dopant | Pteranodon Yummy | Kamakiri Yummy | Ika-Jaguar Yummy | Musca Zodiarts | Scorpion Zodiarts | Sagittarius Zodiarts | Skydain | Groundain
Footsoldiers: Shocker Combatmen | Chaps

Army of Resurrected
Leader: Demon King Psycho
Commanders: Space Reider
Rhino Doubler | Lizard Doubler | Zan Vardo | Karateloid | Bulldozerloid | Parabolaloid 2 | Chief of Staff Damaras | Development Technical Officer Insarn | Dyrandoh | Stargull | Sneak Brothers | Dogormin | Doukoku Chimatsuri | Dayu Usukawa | Chinomanako | Nunchuck Banki | Long | Sanyo | Suugu | Sea Fist Demon Rageku | Furious Demon God Gai | Grand Beast Rei | Agent Abrella

Badan Empire
Leader: Generalissimo of Badan
Commanders: Ambassador Darkness | Kamen Rider Fifteen | Llumu Qhimil | General Shadow | High Priest Baraom | General Jark
Kaijin: Scorpion Man | Saboteguron | Ghoster | Zanjioh | Shiomaneking | Poison Lizard Man | Jaguarman | Girizames | Hiruchameleon | Ganikomol | Turtle Bazooka | Marshal Machine | Sword Master Birugenia | Schwarian | Doras | Garai | Suddendas | Bird Dopant | Kamakiri Yummy | Ika-Jaguar Yummy | Shocker Greeed | Chameleon Zodiarts | Libra Zodiarts | Arachne
Footsoldiers: Shocker Combatmen | Destron Combatmen | Combat-Roids | Chaps
Allies: General Schwarz

2015 Shocker
Leader: Great Leader of Shocker
Commanders: General Black | General Shadow | Marshal Machine | High Priest Darom | General Jark | Super Galaxy King | Schwarian | N-Gamio-Zeda | Lobster Orphnoch | Weather Dopant | Sagittarius Nova | Phoenix | Demushu | Roidmude 089 | Kamen Rider 3
Kaijin: Garagaranda | Cheetahkatatsumeri | Zanjioh | Shiomaneking | Poison Lizard Man | Poison Lizard Man | Girizames | Turtle Bazooka | Roidmude 057 | Roidmude 016 | Roidmude 076
Footsoldiers: Shocker Combatmen

Game World
Eight Kirino | Another Hiiro | Kamen Rider Dark Kabuto | Kamen Rider Dark Drive | Kamen Rider Dark Ghost | Kamen Rider Genm Zombie Gamer

Shocker (Game World)
Leader: Shocker Leader III
Commanders: Ambassador Hell | Space Ikadevil | Redyue | Paradox Roidmude | Bat Amazon | Black Cross King | Raimein | Emperor Z | Gengetsu Kibaoni | Ginis
Footsoldiers: Shocker Combatmen | Buglars | Zorima | Combatant Kuros | Moeba