S1, E4: Yaiba may have gotten his hands on the Raijinken, but it's the Thunder God's power concealed within that has turned the tables on him. The blade's potency has practically swallowed Yaiba whole, leaving him in a state of frenzied rage! To take back control, Yaiba undergoes special training with the fabled swordsman Musashi. But time is running out. Onimaru, now a possessed oni, has unleashed the Eight Ogres. And having taken Japan's National Diet Building, Onimaru makes it clear he's after more than just political might. His demon eyes are steadied on Yaiba's Raijinken. To take his prize, he orders two of his henchmen - Mr. Frog and Mr. Snake - to do what they must.