Foundation X is a recurring antagonist faction in the Neo-Heisei era of Kamen Rider. They are an underground research organization focusing on illegal projects with phenomenal energetic potentials. They make their debut in Kamen Rider W as the backers of Museum and later appear in Kamen Rider Fourze as the benefactors of the Zodiarts and as the main antagonist faction in Kamen Rider x Kamen Rider Fourze & OOO: Movie War Mega Max and Kamen Rider Heisei Generations FINAL: Build & Ex-Aid with Legend Riders, as well as the V-Cinema Kamen Rider W Returns: Kamen Rider Eternal.


The massive projects they focus would provide in return immeasurable profit and research data from sponsoring different organizations to their respective project. They first debut in Kamen Rider W, sponsoring the Musuem for their Gaia Memory research, involving the investigating the true Gaia Memory and the artificial Gaia Memories. After Ryubee Sonozaki dies, the foundation takes over the Gaia Impact project.

But after the death of Jun Kazu, Foundation X cancels all Gaia Memory research to focus on other prospective projects, such as the O Medals and later the Cosmic Energy research of Mitsuaki Gamou. Foundation X is also known for creating Dummy Kaijin, which are kaijin that resemble and hold the powers of the kaijin they represent, but are actually manifestations of Gaia Memories, Medals, or Cosmic Energy.


All members of Foundation X wear white business suits, classifying them as both researchers and business merchants of death.





Foundation X in 009

Foundation X in the Cyborg 009 graphic novel.

  • Foundation X is the financial backer of many evil organizations and research facilities. Their manner of involvement with other organizations is somewhat similar to Shocker and the Great Leader's support of evil organizations in the Showa Era.
  • The book "General Facts of Kamen Rider" implies that Foundation X are connected to the similarly-named Foundation from Shin Kamen Rider: Prologue.
  • In the graphic novel adaptation of Cyborg 009, Foundation X is revealed to be a supporter of the death merchant organization Black Ghost and is mentioned several times as "The Foundation". Its name is revealed towards the end when one of its unseen operatives kills Sekar on an unnamed space station for his betrayal and failure to defeat the 00 Cyborgs.


           Kamen Rider W Villains

Museum/Sonozaki Family
Ryubee Sonozaki | Saeko Sonozaki | Wakana Sonozaki | Kirihiko Sudo | Mick | Shinkuro Isaka | Masquerade Dopants

Foundation X
Neon Ulsland | Jun Kazu | Tabata | Doctor Prospect | Lloyd | Shion

Katsumi Daido | Jun Kazu | Maria S. Cranberry | Kyosui Izumi | Reika Hanehara | Ken Ashihara | Gozo Domoto

Magma Dopant | T-Rex Dopant | Money Dopant | Anomalocaris Dopant | Cockroach Dopant | Sweets Dopant | Virus Dopant | Violence Dopant | Masquerade Dopants | Arms Dopant | Bird Dopant | IceAge Dopant | Triceratops Dopant | Liar Dopant | Puppeteer Dopant | Invisible Dopant | Nightmare Dopant | Beast Dopant | Zone Dopant | Yesterday Dopant | Quetzalcoatlus Dopant | Hopper Dopant | Gene Dopant | Jewel Dopant | Old Dopant | Energy Dopant | Oyakodon Dopant

           Fourze Logo Villains

Horoscopes: Sagittarius Zodiarts | Virgo Zodiarts | Libra Zodiarts | Leo Zodiarts | Scorpion Zodiarts | Cancer Zodiarts | Aries Zodiarts | Capricorn Zodiarts | Aquarius Zodiarts | Taurus Zodiarts | Gemini 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

Foundation X
Lem Kannagi | Katal | Solaris | Chancellor Kiima

Space Ironmen Kyodain
Groundain | Skydain

Stardust Ninja Dustards

           EX-AID LOGO Villains

Executives: Gamedeus | Parado | Graphite Bugster | Lovelica Bugster
Minor Bugsters: Salty Bugster | Alhambra Bugster | Revol Bugster | Motors Bugster | Gatton Bugster | Vernier Bugster | Kaiden Bugster | Charlie Bugster

Genm Corp.
Masamune Dan | Kuroto Dan | Ren Amagasaki | Hiiro Kagami

Next Genome Institute
Dr. Pac-Man | Soji Kuruse | Kazuhige Ryuzaki | Ageha Takeda | Saiko Yaotome

Foundation X
King Dark's Hologram | Kaisei Mogami
Beast Rider Squad: Kamen Rider Ouja | Kamen Rider Tiger | Kamen Rider Sasword | Kamen Rider Dark Kiva | Kamen Rider Beast

Machina Vision
Johnny Maxima | Kagenari Nagumo | Ninja-Players

Taiga Hanaya

           BUILD LOGO Villains

Night Rogue | Blood Stalk | Takumi Katsuragi | Shinobu Katsuragi | Nariaki Utsumi | Shingo Kuwata | Eita Kawai | Masahiro Nabeshima | Norio Matsui | Yoshikazu Takahashi | Faust Guardians

Yoshiko Tajimi | Blood Stalk | Kazumi Sawatari | Hokuto Three Crows | Akaba | Aoba | Kiba | Massugu Ubukata | Hokuto Guardians

Masakuni Mido | Kamen Rider Rogue | Fu Washio | Rai Washio | Seito Guardians | Hard Guardians

Namba Heavy Industries Ltd.
Juzaburo Namba | Nariaki Utsumi | Fu Washio | Rai Washio | Sawa Takigawa | Kaisei Mogami | Guardians | Hard Guardians

Blood Tribe
Kengo Ino | Ryoka Saiga | Mitsuomi Gohara | Evolt | Killbus

Needle Smash | Strong Smash | Burn Smash | Flying Smash | Press Smash | Ice Smash | Stretch Smash | Fang Smash

Simon Marcus | Keiji Uraga | Phantom Crushers | Guardians | Hard Guardians

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