B't X

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 has to learns differently. Not long after Metal Face and his B't Madonna leave, X and Teppei are attacked by the Fifth Unit Ryukon Troops.

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.

X is finally willing to cooperate with Teppei. Suddenly, one of the best fighters in the Machine Empire appears before them. Je'taime's sonic attack is called the Deadly Carol. X and Teppei have never been up against fighters as strong as these two!

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!

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!

X and Teppei thought that Captain Hook and his B't had been defeated, but apparently 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.

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 to save Gaku. They have to wash the poison off of Gaku and themselves if they want to survive. Of course the oasis is protected.

Teppei and X manage to 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 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. For their luck, some stranger helped him. 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.

Without warning B't Raido appeared in front of Teppei and X. Ron's donor is one of the greatest fighters in the Machine Empire. Teppei and X have never fought anyone as tough as Ron before. He has the power of one of the Spirit Generals.

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!

B't Lamu and the warrior Kaos are getting very good. Kaos attacks and cuts Teppei through his Battle Gear. Teppei and X try to win though, no matter what it takes! Will they become more than just partners during this fight?

Teppei and X arrive at the next point and find themselves in a huge graveyard. In the middle of the graveyard they find a giant tree full of skeletons! There they meet a girl named Maria, who is terrified of something evil that lives there.

X has received a lot of damage and injuries from the Reaper. Meanwhile Teppei and X are in serious trouble too. They must become united to save themselves from total destruction and fulfill Maria's dreams!

Teppei and X are finally united. X has revived his Prism of Aura and they have defeated the Reaper. X is still injured from the battle, but his next enemy already shows up to fight him.

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.

When Teppei wakes up after the last battle, he finds X in pieces in front of him! Someone has dismantled him. He finds out that he's been rescued by Hokuto and B't Max - one of the legendary Spirit Knights of the Machine Empire.

X is dying and now the strongest of the Dark Knights, Mira, shows up to fight them! Teppei fights back with his Messiah Fist and tries and keep X out of it, but X wants no part of it and attacks on his own.

Hokuto has managed to rescued Teppei and X! B't Max rebuilds X into the Neo B't X. Bigger, badder and better than ever! X and Teppei were flying away from B't Max when they were attacked again. This time by Balzac and his B't Savanna.

Teppei and X meet up with Fou, Je'taime, Hokuto and B't Max again. Teppei and X have to battle their way into the Machine Empire. These enemies are stronger than expected. They have to make it though, if they want to get into the Area and rescue Kotaro!

Kotaro struggles to figure out a way to destroy Raphael. If Raphael keeps metamorphosing, he'll absorb the entire planet! Kotaro has to figure out what exactly Raphael is and keep him from being killed by his jailer in UnderHell! Meanwhile Fou must battle one of the Dark Knights to save Karin!

It seems like an endless fight to destroy the B't Lalaynya and her donor Myslim! No matter what X and Teppei do, she regenerates and comes after them again! It's been a very hard battle so far, but nobody seems to take the upper hand.

Teppei and X find out that they have defeated Lalaynya, but not Myslim! Myslim counterattacks with his Cyber Whip and hits Teppei. The poison blindfolds Teppei. Teppei has to trust X completely and X responds by creating a new counterattack.

Hokuto and Fou are on their way into the Area to clear up some doubts about the Machine Empire. X and Teppei are also trying to go to the Area, but Ron of the East tries to stop them all! He asked to Teppei to prove he has a piece of the sun and attacks!