Hizuru Ono

During a battle against Destron's forces, Shiro Kazami helps a priest who has been attacked by the evil organization's kaijin Hasami-Jaguar. Little does he know that the church where the priest resides is a front for a Destron hideout. After finding out the organization's latest motive, Kamen Rider V3, along with the Double Riders, must stop Destron from detonating a nuclear bomb in Tokyo. (imdb)

Kamen Rider V3, trying to protect a family from Destron, is outnumbered by Destron soldiers, and Dr. G. (Dr. G is from the V3 tv series). So, Kamen Rider 1, and 2 (who were in Austrailia thought to have been killed in episode 2 of the V3 tv series) come to help.