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

Teppei and X finally make it to the first point! Here, they meet a huge robot named Big Rock who is piloted by a young boy named Gaku. The robot doesn't last long against X and that's when the true guardian for this point shows up! This point is guarded by a B't named Groupie that can eat ANYTHING!! Humans, robots, tanks....you name it! His donor is Captain Hook. Captain Hook feeds Gaku to his B't and Teppei and X allow themselves to be eaten also, so they can rescue the boy! Will they get out alive?????Episode summary graciously provided by Vortex Fansubs

X and Teppei thought that Captain Hook and his B't had been defeated! But he hadn't!!! Captain Hook gives them a taste of his weapon, the Hanging Rod and just about fries them. His B't Groupie revives also and comes back to try and eat them again. X is damaged, but he and Teppei must still overcome these two again if they're going to continue into the Area!Episode summary graciously provided by Vortex Fansubs

Gaku has been poisoned by the ""Heavy Steam"" given off by Groupie. X and Teppei must rush to the next point, where an oasis can be found. They have to wash the poison off of Gaku and themselves! One BIG problem though! This oasis is protected by the illusionist Kamiura and his B't Mirage. Without even knowing that they were already caught in his illusion, X and Teppei start to fight each other...Episode summary graciously provided by Vortex Fansubs

Teppei and X break free from the illusion! X goes after the B't Mirage and Teppei goes after Kamiura. Both of them have already been affected by the Evil Flower pollen. Kamiura attacks Teppei by using illusions and Teppei has to break free from yet another trap before he can defeat Kamiura! X has to shut down all of his senses to attack Mirage and they have a serious battle... Episode summary graciously provided by Vortex Fansubs

X and Teppei are attacked by the B't Madonna and Metal Face. They force X and Teppei to crash into a deadly valley. It's a place where the sound of the wind can affect a B't and shatter them completely!! But, there was a man who came and helped them. He is Professor Zaji and he's wanted by the Machine Empire. To escape from the valley and rescue the Professor, X and Teppei must be united to overcome the effects of the wind! Episode summary graciously provided by Vortex Fansubs

Without warning, B't Raido appeared in front of Teppei and X! His donor is one of the greatest fighters in the Machine Empire. His name is Ron. Teppei and X have never fought anyone as tough as Ron before! He has the power of one of the Spirit Generals! Episode summary graciously provided by Vortex Fansubs

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

B't Lamu and the warrior Kaos are very good! Kaos attacks and cuts Teppei through his Battle Gear! Teppei and X will win though, no matter what it takes! They'll become the best of buddies! Episode summary graciously provided by Vortex Fansubs

Teppei and X arrive at the next point and find themselves in a huge graveyard. In the middle of the graveyard is a giant tree full of skeletons! They meet a girl named Maria, who is terrified of something evil that lives there! Can Teppei and X help Maria and defeat this point's guardian??? Episode summary graciously provided by Vortex Fansubs

X has received a lot of damage from the Reaper! Teppei and X are in serious trouble! They must become united to save themselves from total destruction and fulfill Maria's dreams! Episode summary graciously provided by Vortex Fansubs

Teppei and X are finally united! X has revived his Prism of Aura and they have defeated the Reaper. X is still terribly damaged from the battle though, and now another enemy shows up in front of them! X might die... Episode summary graciously provided by Vortex Fansubs

X is trying to fly Teppei as close to the Area as possible before he dies. Now another of the Machine Empire's hit men shows up to attack them! His name is Rai of the Dark Knights. When Teppei and X fight back with the Prism of Aura, Shadow X appears!Episode summary graciously provided by Vortex Fansubs

Kotaro struggle to figure out a way to destroy Raphael! If Raphael keeps metamorphasizing, he'll absorb the entire planet! Kotaro has to figure out WHAT Raphael is and keep from being killed by his jailer in UnderHell! Meanwhile, Fou, must battle one of the Dark Knights to save Karin!Episode summary graciously provided by Vortex Fansubs