However, they can assume their true form when a Bakugan game is played.

They cannot take on their true form (as they were in Vestroia) in the human dimension, and take on the form of a sphere that pops out (or stands) into a miniature form. Dan and the Brawlers worked together to make rules for a game that used the Bakugan on Earth. One day, strange cards with Bakugan inside of them, fell from the sky on Earth and Vestal, because the Silent Core was stolen and the Infinity Core fell to Earth, creating a rift between dimensions. At the start of the series, only two full descendants of the original two remained, though all Bakugan are descendants of them. In time more Bakugan emerged, and their origin was lost to legend. Vestroia was seeded by the Dragonoid, while the Dharaknoid seeded Neathia and Gundalia. One contained the six attribute worlds of Vestroia, and the other Neathia and Gundalia. The two of them ripped their home universe into two separate realities. A long time ago, a mysterious force known as Code Eve constructed the first two Bakugan Dharaknoid and Dragonoid, based off genes from an unknown ultimate warrior.

Bakugan dimensions game