Earth faces a crucial moment. Forces from planet Dada are attempting to conquer it, turning all mankind into livestock for food and labor.
Young Kenji’s parents and two brothers have been taken away and now he is alone. He is soon attacked by the Dadas, but is saved by a flying saucer, from which two space robots emerge. They are his two brothers, transformed into Cyberoids with computer-controlled brains. They are gifts from Kenji’s father, who has been put to work at the enemy planet’s laboratory.
With the help of the super mechanism and the brotherhood that binds the trio together, Kenji battles against the aggressors.
