無敵鐵金剛
In the crossover film "Mazinger Z vs. Devilman" (1973), both Akira and Koji Kabuto from "Mazinger Z" team up to face an army of demons led by Dr. Hell. Akira is tortured by the demons for being a traitor. However, Koji saves Akira, although Hell and Ashura escape alive. The movie ends with Koji and Akira on good terms.