The three traitorous Students Kenji Tsukigata, Rui Senda and Gou Omura come back from Outer Space in the name of the Armed Brain Army Volt to begin their attack on the Earth.
Yusuke is approached by Takuji's little brother to help complete a car he was working on, which becomes sabotaged by Dr. Kemp and an engine Brain Beast.
Takeshi and the Liveman try to work out a final solution regarding Gon while Obular decides to experiment in making the dinosaur into a city-destroying giant.
Tetsuya and Junichi, the siblings of the Liveman's deceased friends, push forwards to do whatever it takes to defeat Giga Volt, even with unexpected assistance.
With the continued threat of Giga Volt and Tetsuya and Junichi still driven by revenge, the Liveman must figure a means to come together as a true team to defeat Volt's greatest weapon.
Junichi is implanted with the child of Guildos and Butchy's Brain Beast, forcing him to make a decision regarding his unusual situation.
Great Professor Bias begins a mysterious competition for his generals.
After discovering the horrifying truth about himself and Guildos, Butchy goes on a rampage through Earth which is interpreted sympathetically by Megumi.
Although changed back to his former idiot form, Arashi continues to try and prove his true worth in a climactic showdown with Kemp's most powerful Brain Beast.
Mazenda fights the Liveman to complete her goal of achieving a thousand-point brain for Bias, even as Gou tries to warn of the consequences of doing so.
As a Bias with restored youth descends to Earth to continue his cycle of destruction for the sake of knowledge, the Liveman must hold him off and find a way of either changing his ways or stopping the mad genius permanently.
