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Kamen Rider V3, the second Kamen Rider series, aired from 1973 to 1974.Kazami Shiro was marked for death by the evil group Destron after witnessing a murder by their hands. When Destron forces him to murder his family, Kazami pleads with his saviors, the Kamen Riders to make him into a cyborg-warrior too. They only comply after he is wounded saving their lives; now, after the sacrifice of his saviors, Kazami as Kamen Rider V3 takes on the forces of Destron. Later, he is joined by former Destron scientist Yuki Jouji, who takes up the mantle of Riderman, also known as the fourth Kamen Rider.
This show features examples of:
Achilles' Heel: A devastating, but handily forgotten, one is discovered in the third episode when it turns out that if the fans in V3's belt are clogged he loses his power. Slightly more prevalent is that once Shiro changes, he has to wait exactly three hours before he can do so again.
All Your Powers Combined: A lesser example of this. V3 was stated to have all the strength of #2 and all the technique of #1. His more well-known trait, his "26 Secrets," are unique to him.
Curbstomp Battle: What happened when a mutant tried to kidnap, brainwash, and marry V3's love interest. He spent the better part of seven minutes simply punching the hell out of the guy through at least three different scenes.
Evil Twin: Riderman gets one late in the series. He actually ends up switching places with him.
Expy: Of a sort. While most (if not all) Riders are based off of some animal or have some sort of theme, Riderman is generically based on a 'Kamen Rider'. This ties into Yuuki's backstory, and for most of his appearances during this show he is specifically fighting Marshall Armor, not Destron. That he actually gets an Evil Twin is just flat out ironic.
Fully Absorbed Finale: The series ends with a large unresolved plot thread, Destron's leader alive and well, with the monster defeated by V3 just having a tape player inside. However, V3 and Riderman would return in Kamen Rider Stronger to finish that plot thread in Stronger's own finale.
Heel Realization: Riderman has a hell of a realization when he learns the truth behind Destron's actions, which lead him to say some damning words about his obliviousness…
"I've been worshipping the devil!"
…thus setting up the scene for his…
Heroic Sacrifice: Riderman stops a Pluton Rocket from hitting Tokyo by blowing it up mid-flight. While inside. He gets better.
How Do I Shot Web?: V3 has 26 abilities, and since Riders 1 and 2 are apparently killed before they can tell him what they all are, V3 has to figure out what he can do all by himself.
Large Ham: Knife Armadillo rocks this trope like Van Halen. (His human form, not so much.)
Destron's first commander, Doktor G, allows rocks this trope.
Nuclear Weapons Taboo: Averted; in the very second episode, Riders 1 and 2 sacrifice themselves to stop a nuclear bomb planted by the Destrons from going off in the center of Tokyo.
Roaring Rampage of Revenge: Kazami's entire career as V3 is this, as is Yuki's career as Riderman. Note that Kazami started slightly before actually becoming V3.
Scarf of Asskicking: V3 has not one, but two Scarves Of Asskicking. They're actually attached to his shoulders like capes, and V3 couldn't wear a scarf anyway because of his high collar... but what else are we gonna call this?
Training from Hell: Practically any time V3 loses a fight, he turns to Tachibana Tobei. Who... Well. Trains him in ways that involve motorcycle racing, machine guns, taking shots from a wrecking ball...
We Can Rebuild Him: The origin of V3. One of those cases where they didn't give him a full manual, though.