Garai is the oldest of the Fog Mother's children and the secondary antagonist of Kamen Rider J. His true form is the kaijin Cobra Man.
Garai and the Fog arrived on Earth 75 million years after they had previously wiped out the dinosaurs to devour Earth's new dominant life form, humanity. Garai and his siblings abducted Kana to sacrifice her to Fog Mother in order to awaken his "siblings" so they could consume all life on Earth. As the eldest sibling, Garai conducted the ritual to sacrifice Kana while Agito and Zu battled J.
After J defeated Zu and entered the Fog Machine Beast Mothership, Garai completed preparations to sacrifice Kana and assumed his true form as Cobra Man to take on J. Berry came to assist J but Garai swatted her away. Garai initially overpowered J but J was able to regain the strength to save and defeated Garai by rider kicking him onto the altar and impaling him.
Kamen Rider World
Garai was one of the monsters revived by Shadow Moon.
Kamen Rider Decade: All Riders vs. Dai-Shocker
Garai as Cobra Man appears as a member of the Dai-Shocker army within the World of Decade.
Kamen Rider × Kamen Rider W & Decade: Movie War 2010
Garai appears as a member of the Super Shocker organization formed from the remnants of Dai-Shocker.
OOO, Den-O, All Riders: Let's Go Kamen Riders
In the altered timeline where Shocker conquered the world with their kaijin Shocker Greeed, Garai was one of the kaijin who served under the organization.
Heisei Rider vs. Showa Rider: Kamen Rider Taisen feat. Super Sentai
Garai appears as a member of the underworld army of the Badan Empire.