The story revolves around Duke Fleed who is a survivor of the Vega Star, raised by Dr. Umon as his adoptive son, and known as Daisuke Umon on Earth. Years after his arrival, he's faced with the threat of King Vega and his army, who want to conquer the Earth. With his friends Koji and Hikaru (and later his kid sister Maria Grace), Duke decides to fight back using his best weapon, the almighty Grendizer.

Kei Tomiyama

Duke Fleed / Daisuke Umon (voice)

Hiroya Ishimaru

Koji Kabuto (voice)

Joji Yanami

Genzo Umon / Great King Vega (voice)

Chiyoko Kawashima

Hikaru Makiba (voice)

Kosei Tomita

Danbei Makiba / General Gandal / Nuke / Whiter (voice)

Kazuko Sawada

Goro Makiba / Lady Gandal (voice)

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Rihoko Yoshida

Grace Maria Fleed / Commander Marine (voice)

Banjo Ginga

Science Minister Zuril (voice)

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Adventure Time: Distant Lands