The Ultimate Team-up!? The Ryoga/Mousse Alliance (史上最強? 良牙とムース同盟 Shijō Saikyō? Ryōga to Mūsu Dōmei?) is the fourteenth episode in the third season of Ranma ½, Hard Battle, and is the 54th episode overall. Learning of the existence of Ranma's oldest and strongest rival, Ryoga, Mousse seeks out the Eternally Lost Boy, hoping that the two together can finally defeat Ranma Saotome, their mutual enemy.