Lesson 38: Biba-Biba! Another Retsu

'''Biba-Biba! Another Retsu''' is the thirty-eighth episode of Engine Sentai Go-Onger.

Plot
Though Mere appraised the Phantom Jūken's power, Rio remains unconvinced of it with to undergo the blood-oath. Sanyo decides to send his other disciple, Gen Jū Minotaur-Ken user Shiyuu, to provide further proof for Long. Meanwhile at SCRTC, Retu and Gou get into an argument over Chashu until Shiyuu begins his attack, with Retu cracking his armor. While the Gekirangers were outmatched by Mere testing her new found powers on them, Shiyuu took advantage to get revenge on Retu. Though hit by Shiyuu's Gengi, Retu is not physically harmed. Gou warns his brother that an attack is always significant no matter how hard the initial blow is. This turns out true when Retu's reflection comes to life and drags Retu into the mirror world so he can take the original's place, with Retu becoming the reflection. While this occurs, Shiyuu enlarged himself and the gang arrive to fight in SaiDaiOh and Geki Fire. However, Mirror Retu reveals himself to be a clone of Shiyuu, using Geki Fire to attack SaiDaiOh. Though the others fell for Shiyuu's deception, Gou was not as easily fooled and saves Retu, destroying Shiyuu's reflection-clones. The real Shiyuu overpowers until Geki BatTohja Wolf arrives, wounding Shiyuu to be destroyed by SaiDaiOh. While Retu and Gou enjoy a victory meal after the fight, Rio criticizes the Gen Jūken more until Long awakens the Mythical General resting within the coffin Sanyo brought with him: the mysterious Gen Jū Chimera-Ken master Suugu.