Final Facedown! Happosai vs. The Invisible Man (対決! 八宝斉VS透明人間 Taiketsu! Happōsai Buiesu Tōmeiningen?) is the tenth episode in the third season of Ranma ½, Hard Battle, and is the 50th episode overall. Happosai has been running amuck worse than usual, prompting Ranma and Akane to plot to take him down. Meanwhile, Soun and Genma return from training under a mysterious Chinese Ninjitsu Master, claiming to now have the skills to defeat their evil master.