Synopsis
Space disasters are revealed to be orchestrated by the Armanoid aliens, who intend to subjugate Earth. Professor Tachibana assembles a team at the Future Science Invention Center and equips Shin, Go, Lisa, and Captain Kenmotsu with advanced vehicles. Three of these Tester units merge to form the massive Zero Tester robot, which defeats the Armanoid threat across thirty-eight episodes. The subsequent episodes, under the title ZT: Save the Earth! (Chikyu wo Mamotte!), target a younger demographic and depict an assault by the new Gallos aliens.