Kamen Rider V3

Kamen Rider V3 is the first sequel series to Kamen Rider and is actually the first season of the series, followed by Kamen Rider X.

Story
Sean Adams is a young photographer who accidentally witnesses a murder being committed by the evil organization Destron. Destron then hunts him down and throws him off of a cliff. The Cosmos then awaken and grant him special powers so that he can become Kamen Rider V3 and battle Destron. At the end of the series, he discovers that he was not originally attacked by Destron, but by the Government of Darkness (G.O.D). The story then continues into Kamen Rider X.

Characters
Sean Adams: Kamen Rider V3. Killed by Destron, became V3 to avenge himself.

Casey: He is at first a soldier of Destron, but later joins Sean as Riderman.