Sensing the strength of their enemy, the Ex Tartao united to form one giant robot.

The Dangai Project began preparations for a battle from a threat from the outer space pirate "Bunker".

Now, in a secret underground organization, Dr. Yonamine and the Dangaioh are prepared to face off against Dr. Katou and his robotic troops.

Due to Ur's AI, it cannot stop fighting and therefore will continually deteriorate until it ceases to function.

The series was originally intended to be 26 episodes long, but was cancelled halfway due to poor reviews and low ratings.