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.

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  Kei Tomiyama

  Duke Fleed / Daisuke Umon
• 
  Joji Yanami

  Dr. Umon
• 
  Hiroya Ishimaru

  Kouji Kabuto
• 
  Chiyoko Kawashima

  Hikaru Makiba
• 
  Kazuko Sawada

  Goro Makiba
• 
  Kenichi Ogata

  Blacky
• 
  Kosei Tomita

  Gandal Shirei
• 
  Keiichi Noda

  Tsurugi Tetsuya