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
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...
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!
