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As of the events during Bakugan: Mechtanium Surge, he is currently the Commander of the Gundalian Forces under the commands of Prime Minister Nurzak. He went back home to Gundalia after the Neathian-Gundalian War ended. He then became a Castle Knight and help beat the Twelve Orders. but later returns to the Battle Brawlers after learning that the Twelve Orders were untrustworthy and held no care for him. Later, he was exposed by Fabia and he returns to the Gundalians and fights against the Battle Brawlers, only to lose many times to them. In order to do so, he lies about the Neathians, claiming they were a war-loving nation and invaded Gundalia. Under orders from the Twelve Orders, he infiltrated the Battle Brawlers to sway them to aid Gundalia in the Neathian-Gundalian War.
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He originally worked for Barodius thinking he could get his freedom. He first appears in the finale of Bakugan Battle Brawlers: New Vestroia (for 5 seconds) before being properly introduced in Bakugan: Gundalian Invaders as a main character. Ren Krawler (レン・クロウラー, Ren Kurourā ?) is a Darkus Brawler from Gundalia and is also the last descendant of the Protectors of the Dark Bakugan to never allow Linehalt from unleashing his forbidden powers.