Formidable Enemy! The Warrior, Kaos
Teppei and X continue on their journey into the Area. They meet a mysterious old man named Kaos... Kaos and his B't Lamu used to be legendary warriors for the Machine Empire! X and Teppei must struggle to stay alive as Kaos and Lamu attack them! Episode summary graciously provided by Vortex Fansubs
Aired 22/06/1996EP 12 - Formidable Enemy! The Warrior, Kaos

B't X
Teppei is going to visit his older brother Kotaro Takamiya during a scientific conference after training with a mysterious woman named Karen for the past 11 years. However his plans for a family reunion become stalled when a woman named Aramis kills everyone in the conference to kidnap Kotaro. Teppei on the way to save his brother encounters a broken mechanical horse called B't X who revives thanks to Teppei's blood and is now his aide to save his brother from the mysterious Machine Empire.