S2·E50 Swamp Hippos

The Swamp Hippos start terrorizing villages and blame the Dogs. So First Squad and Wu Sung have to stop them. At the same time, Wu Sung tells First Squad that his brother Dog King hasn't been comfortable living amongst humans. When First Squad defeats the Swamp hippos, the Swamp Hippo King tells them that Twin Masters put 2 chaotic gems in his mouth.