Stream anime episodes online for free, Watch Ranma 1/2 Episode 138 English version online and free episodes. Anime Episode guide, Chapter Ranma 1/2 Episode 138 English dubbed Ranma’s Greatest Challenge!? Ranma and Happosai team up to conquer the Ogre Festival of the Dark. Happosai prepares Ranma personally for the match of his life. If Ranma loses The Ogre Festival of the Dark it will be the end of the Anything-Goes School of Indiscriminate Grappling. Winning the tourney, the true horror of the situation is revealed.