Tri-Twister Take Down is the 5th episode of Bakugan: Mechtanium Surge. It aired on March 13th, 2011.
Some tension between the Brawlers rises, when Shun suggests to Dan that he should take a break from battling as to avoid another one of Drago's power loss disasters. However, Dan interprets this as Shun mistrusting him and they argue. Shun is later confronted by Sellon, who still wants him on her team and suggests that he give Dan some tough love. Later the Brawlers are challenged by two boys named Sion and Lucas calling themselves the Tri-Twisters. Shun and Marucho decide to take it themselves without telling Dan, but have some trouble against the opponents. Dan discovers this and wants to help but begins to realize that Shun may have had a point earlier. They then discover that there is a third Bakugan, previously attacking invisibly, present. Sellon and Anubias suddenly interrupt the battle, wanting to teach the boys a lesson in honor and easily defeat them. The battle is then declared no contest and Dan and Drago realize that if they don't figure out how to control their powers soon, there will be more trouble.