Shin Mazinger Shougeki! Z-hen EP1 - Grand Finale

The first episode begins in medias res, depicting the climatic final battle between the Photon Power Lab and Dr. Hell's forces. Meeting the attack head on are the Mazinger Corps and the Kurogane house, who attempt to stand their ground against Dr. Hell's three armies, led by Baron Ashura, Count Brocken and Viscount Pygman. As the battle is being waged we find out that the protagonist Kouji has been missing, and is shown to be in an unknown location, for unknown reasons. While there he meets a variety of strange beings including Zeus. By the time he returns, Dr. Hell's forces have already defeated most of his comrades and Kouji prepares to defeat Dr. Hell, for their sake.