Evolution Revolution is the 18th episode of Bakugan Battle Brawlers. It aired on October 21st, 2007.
After losing Preyas to Klaus, Marucho who is grief stricken begs Klaus to return him but Klaus refuses. Klaus opens a portal to Masquerade's evil lair, to which Marucho and Runo both jump through after Klaus. When there, they access Masquerade's computer and learn about the wonders of Bakugan evolution and its intense power. Just when they thought it couldn't get any stranger, Julio Santana the 4th ranked brawler shows up and challenges them to a battle. Surprisingly, Dan opens his Gate Card at the same time as Runo, Marucho and Julio and is dragged into the battle. Julio insists they both take him and his Haos Tentaclear on.