UFO Robot Grendizer vs. Great Mazinger

Alien invaders take over Great Mazinger who is at the entrance of a museum next to Mazinger Z as symbols of peace. Grendizer fights the evil invaders and Great Mazinger is recovered. When the Vegan empire dispatches a new general to oversee the takeover of Earth, he quickly manages to capture Koji Kabuto and, learning of Great Mazinger through interrogation, quickly commandeers it from a museum where it was kept as a symbol of peace. It is now up to Duke Fleed aboard Grendizer to stop humanity's former defender from becoming its destroyer.

• Osamu KasaiDirector
• Keisuke FujikawaScreenplay

• Kei TomiyamaDuke Fleed / Daisuke Umon
• Joji YanamiDr. Umon
• Hiroya IshimaruKouji Kabuto
• Chiyoko KawashimaHikaru Makiba
• Kazuko SawadaGoro Makiba
• Kenichi OgataBlacky
• Kosei TomitaGandal Shirei
• Keiichi NodaTsurugi Tetsuya