Teppei's brother Kotaro is a scientific genius and is kidnapped by the Machine Empire. Teppei gives chase and ends up in the Area of the Machine Empire! He is attacked by the B't Madonna and her donor Metal Face. Badly injured and bleeding everywhere, Teppei fights back, but he's no match for the B't Madonna! However, Teppei's blood reactivates X, whose body had been buried in the scrap pile. Once again active, X breaks free of the scrap, while Madonna has to take her donor Metal Face back to the Machine Empire for treatment. He had been seriously injured by Teppei just moments earlier. Meanwhile, Kotaro awakens in the Machine Empire. Major Aramis tells him about the Area and the B't's. She also starts to explain about the ultimate B't - Raphael. Asked to join them, Kotaro turns them down. He has faith in his brother and knows Teppei will be coming to save him! Episode summary graciously provided by Vortex Fansubs

Teppei thinks he has gained Karen's powerful partner X, as an ally! He soon learns differently. Not long after Metal Face and his B't Madonna leave, X and Teppei are attacked by the Fifth Unit Ryukon Troops. Can Teppei and X overcome their problems and work together to defeat the Fifth Unit???Vortex Fansubs

X's original donor is Karen and he'll obey only her! He's going to do everything he can to get rid of Teppei and go to find Karen! Teppei finally realizes that X isn't just a robot and gives up - telling X where he can find Karen. He then proceeds back into the Area alone and is soon attacked by the Ryukon Troops. Can Teppei defeat all of them by himself or will X return to help him???Episode summary graciously provided by Vortex Fansubs

X is finally willing to cooperate with Teppei. Suddenly, one of the best fighters in the Machine Empire appears before them! Fou Rafine, and his B't Je'taime! Je'taime's sonic attack is called the Deadly Carol. X and Teppei have never been up against fighters as strong as these two!Episode summary graciously provided by Vortex Fansubs

When Teppei comes around after his last battle, he finds himself being treated in Fou's chapel! X, however, has been deactivated and is lying motionless... One of the Machine Empire's hit men, Kaas, shows up and takes some of the children hostage to use against Fou. Je'taime, Fou, and Teppei and X must work together to stop the soldiers from getting away and reporting back to the Empire!Episode summary graciously provided by Vortex Fansubs