What a fool!
~ Hydranoid talking to Chan Lee and Fourtress

Hydranoid is an antagonist-turned-protagonist and an current character from Bakugan Battle Brawlers. He was responsible for sending the Bakugan to the Doom Dimension. He was the brief Guardian Bakugan of Masquerade.

As Hydranoid

Hydranoid has sent Reaper to the Doom Dimension, he was evolving into Dual Hydranoid after turned against Harpus, Fourtress, Cycloid, Tentaclear and Sirenoid in order to evolve.

As Alpha Hydranoid

Hydranoid crushed Exedra and he has 3 heads, he vows to defeat Drago and gets the Infinity Core, but in a episode, he redeems himself along with Masquerade and becomes Alice's Guardian Bakugan and renounces his villainous ways. He later becomes an protagonist in the series.