Mazinger Z vs. The Great General of Darkness
Mazinger Z vs. The Great General of Darkness (マジンガーＺ対暗黒大将軍, Majingâ Zetto tai Ankoku Daishôgun) is a 1974 Japanese mecha animated film that served as an alternative link between the Mazinger Z series and the Great Mazinger series. It basically introduces Great Mazinger to the audience, as well as his enemies from the Mikene Empire, showing the defeat of Mazinger Z. It was released on July 25, 1974.
The evil Mycene Empire unleashes its army against humans in a world wide strike. Koji Kabuto must risk his life in a desperate journey to find Mazinkaiser so he can defend the Earth against this ruthless new enemy.