Dragonoid Colossus is the 25th episode of Bakugan: Gundalian Invaders. It aired on October 9, 2010.
Ren decides it is finally time to stand up to Emperor Barodius. Dharak decides to detach from Exokor and let it do the fighting for him. Meanwhile, the rest of the Brawlers are taken down by the Twelve Orders. Ren seems to be having trouble with Dharak but refuses to let Dan help him because he has a score to settle with Barodius for forcing him to remain in the darkness. Then Linehalt suddenly unleashes his forbidden powers but loses control of them and creates a shockwave so powerful it threatens to destroy the planet. Meanwhile, Queen Serena prays to the Sacred Orb to protect the Brawlers and after the shockwave reaches them, the Sacred Orb sends out Colossus Dragonoid a spirit that is the Orb's last defense. It stops Linehalt's powers and defeats him then disappears into Dan's BakuMeter. After seeing this, Emperor Barodius and the Twelve Orders decide to retreat. After the battle, Ren approaches the Brawlers and decides he needs to live in solitude to prevent the forbidden powers from being unleashed but the Brawlers convince him that they simply need to be controlled. Relieved, he transforms back into his human disguise and rejoins the Brawlers. Everyone welcomes him back except for Fabia who stands away from everyone else and seems to still distrust Ren.
- Colossus Dragonoid
- Lumino Dragonoid
Battle Gear Seen
- There is a deleted scene in which Ren whispers Marucho's name after Marucho tells him that "Everything is water under the bridge". It was only aired in the Japanese version.
- The explosion seen in space, as a result of burst of Linehalt's Forbidden Power resembles the one seen in Ultimate Bakugan from Season 2.