Destron

Destron (デストロン, Desutoron) is an international organization bent on conquering the world, through terror and destruction. Destron is formed under the guidance of the mysterious Great Leader by surviving members of Gel-Shocker. Although Destron has branches in every country and seeks to dominate the entire planet, its main headquarters is in Japan and so Japan is Destron's primary target.

Riderman

Riderman (ライダーマン, Raidāman), also known as The Avenging Demon or Kamen Rider No. 4, is a former member of the organization known as Destron. His real name is Jōji Yūki (結城丈二, Yūki Jōji).

Kamen Rider V3

Kamen Rider V3 (仮面ライダーV3, Kamen Raidā Bui Surī)’s realname is Shiro Kazami (風見 志郎, Kazami Shirō), born 5 May 1950. He is a 22-year-old college student at Jōnan University with a major in biochemistry.

Gel-Shocker

Gel-Shocker (ゲルショッカー, Geru Shokkā) is an evil organization that is formed through the merge between Shocker and Geldam, a mysterious organization from America.

Geldam

Geldam is an evil organization which joins forces with Shocker and its Great Leader after the latter's defeat by the Double Riders. They merge to form Gel-Shocker.