The fate of Earth lies in the hands of five trainee warriors operating the formidable Voltes V, a machine specially built to counter the outer space enemies.

When the enemies move toward the bird-shaped island of Ootorajima, a big sacrifice saves Voltes V and the heroes to give Earth a fighting chance.

While the enemies bring a stronger robot to better their position in the battle, one of the heroes learns a life-altering truth about his tragic past.

When the going gets tough, the efficacious "catching-a-butterfly" technique becomes the heroes' only hope against the deadly samurai robot deployed by the enemies.

When one of the heroes leaves for a battleship model competition, the enemies decide to use this window to destroy the Voltes V team by unleashing two strong fighters.