UFO Robot Grendizer
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.

Season 1 · Episode 2 ·
Prince of the Other World
Koji discovers the identity of the Duke Fleed, but has no time to ask questions because Vega attacks. Duke Fleed and Koji unite their power and push back the enemy.
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Episode 2 of season 1 of UFO Robot Grendizer: “Prince of the Other World”. Aired 1975-10-12. Watch it online free on ZapFlix.