Kazami Shiro's rival, Yoshioka Masaru, and other top racers in the All Japan Motorcross Championship, are captured by Destron's Lens-Ant. He transforms them into the Destron Hell Squad in order to rob a convoy carrying a nuclear-powered satellite. The mutant also captures Junko and Shigeru! Will Shiro save his friends? Can V3 defeat not one, but two mutants, single-handedly?