Regulos learned the Cosmo Beast Style on Planet D60. However, the Alien Magmas attacked and killed the others. Regulos became the last survivor, and was betrayed by a fellow fighter known as “Dias,” who was really Absolute Diavolo who manipulated them all to steal the Cosmo Buffalo. Regulos was imprisoned in Narak, rescued by Yullian and Astra, battled Diavolo, and joined the Galaxy Rescue Force. He bonded with the Cosmo Tiger and Cosmo Dragon, and used the technique Red Dragon White Tiger Fist.