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Foundation X is an underground research organization focusing on illegal projects with phenomenal energetic potentials. 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 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.
  • 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 Villains

Foundation X
Neon Ulsland | Jun Kazu | Tabata | Doctor Prospect | Lem Kannagi

Sonozaki Family: Ryubee Sonozaki | Saeko Sonozaki | Wakana Sonozaki | Kirihiko Sudo | Mick

Ankh | Uva | Kazari | Gamel | Mezool | Ankh (Lost) | Kiyoto Maki | Shocker Greeed

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

Wiseman | Phoenix | Medusa | Gremlin

Yggdrasill Corporation
Takatora Kureshima | Ryoma Sengoku | Lock Dealer Sid | Yoko Minato | Mitsuzane Kureshima | Oren Pierre Alfonzo | Kurokage Troopers

Overlord Inves
Rosyuo | Redyue | Demushu | Dyudyuonshu

Helheim Forest

Executives: Freeze | Heart | Brain | Roidmude 004 | Roidmude 006 | Medic | Mashin Chaser | Gold Drive
Reaper Legion: Roidmude 013 | Roidmude 015 | Roidmude 019 | Roidmude 021 | Roidmude 022 | Roidmude 028 | Roidmude 032 | Roidmude 034 | Roidmude 035 | Roidmude 044 | Roidmude 045 | Roidmude 054 | Roidmude 059 | Roidmude 070 | Roidmude 075 | Roidmude 081 | Roidmude 092 | Roidmude 094 | Roidmude 100 | Roidmude 101 | Roidmude 104 | Roidmude 105
Other Roidmudes: Roidmude 016 | Roidmude 036 | Roidmude 057 | Roidmude 060 | Roidmude 062 | Roidmude 074 | Roidmude 076 | Roidmude 098