Machine Robo Mugenbine - Storyline

Storyline

Little backstory is given for the Mugenbine toyline aside besides commercials and the back of toy packaging.

According to fiction from the commercials, the story takes place in Mugenpolis, where the first Mugenbine, Air Leon, was developed, soon followed by Build Giraffe and Carry Eagle, designed to counter emergencies in the city. The only villain seen is Xenonbine, an evil Mugenbine capable of more combinations than any of the others at the time. The commercials also explained the characters Great Rex, Heat Tricera, and Zord Elephant were created by Mugenbine's North American branch. After Victory Leon is created to serve as a gateway to the city, the commercials begin referring to it as Mugen City, and introduced the Mugen Bases. Arch Tiger's commercial also implies an unseen, ominous enemy as its appearance causes the sky to turn purple. There is also a side story featuring the Ridebine characters who are searching for legendary weapons, a theme supported by the manga included with these figures where they battle a machine monster powered by these weapons, as well as their inclusion with numerous Teiouryu figures as "prize parts", the weapon parts from Assault Leon, Energy Rhinoce, and Great Rex molded in gold plastic.

At some point, the storyline on the packages tell that the Mugenroids are taken over and turn against the city. As a result, the Buildroids are created, with human pilots that could not be controlled. They're left as the only protectors of Mugen City in the face of the new threat. The storyline is presumed to be ongoing as the most recent toy releases also includes a pilot figure.