Destron blows up the research facility of Professor Kawai, in order to secure his artificial heart technology in order to strengthen their mutants. Kawai's subject comes back to life, and as Knife-Armadillo, stalks the professor for revenge. The resilient mutant even repels V3 in battle! To improve his strength, will V3 survive the harsh rigors of his own brutal training session?

While Kazami Shiro recovers in a hospital, the Rider Scouts search for Destron's outpost, while Buzzsaw-Lizard tries to persuade Kawai to resuscitate Knife-Armadillo, under pain of death. Refusing, he now must witness the execution of his family. Captured by Destron, Shiro hangs over a pool of acid! Can he escape their trap and transform into V3?