Grudge! Kurogane House's Longest Day (Second Part) - S1.E20

Energer Z appeared with Kenzo Kabuto as pilot. Pygman who appears in an hologram implies that Energer Z is looking for Zeus arm, the source of photon energy. Tsubasa appears and gets rid of Pygman's hologram and eventually his idea of handing over Zeus arm to Energer Z. Kouji activates Mazinger Z and fights off Energer Z. The two exchanges blows and fire power. Mazinger Z in the end was losing the battle and Baron Ashura convinces Tsubasa to reveal the whereabouts of Zeus arm in order to help Kouji. Memory came back to the sick Tsubasa when they have discovered Zeus arm as the source of photon energy. The same photon energy Juzo and Kenzo used to built Energer Z with Tetsuya Tsurugi as pilot. Dr. Hell revealed his true plans of world domination. Tetsuya used Energer Z to hide Zeus arm from Dr. Hell. Juzo hostages Dr. Hell but was attacked by Baron Ashura that blinded his one eye. Tsubasa appeared to help Juzo but Kenzo Kabuto appeared hostaging Juzo, his father.