UFO Robot Grendizer (Season 0)

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.

The Great War of the Flying Saucers 0.0
Air date: 1975-07-26
Runtime: 25 min
Overview: Theatrical feature. Considered the pilot/prototype for the UFO Robot Grendizer TV series. Duke Freed is an alien who has escaped to Earth after his home planet was invaded by the armies of Great King Yarban. Five years have passed and now Yarban's daughter, Princess Teronna, is on a mission to find both Duke and his spaceship Grendizer by invading our planet with their fleet of flying saucers.
UFO Robot Grendizer vs. Great Mazinger 0.0
Air date: 1976-03-20
Runtime: 25 min
Overview: Theatrical feature. 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 comandeers it from a museum where it was kept as a symbol of peace. It is now up to Duke Fleed and Grendizer to stop humanity's former defender from becoming its destroyer.
UFO Robot Grendizer - Red Sunset Showdown 0.0
Air date: 1976-12-19
Runtime: 25 min
Overview: Theatrical feature. Widescreen version of episode 49 released in japanese theaters alongside other Toei productions.
Episode 5 0.0
Air date: 1976-07-18
Runtime: 25 min
Episode 6 0.0
Air date: 1979-01-01
Runtime: 25 min
The Great Battle of the Flying Saucers 0.0
Air date: 1975-07-21
Runtime: 25 min
Overview: Compilation movie of the Force Five Grandizer, by Jim Terry productions.
Episode 8 0.0
Air date: 1978-01-10
Runtime: 25 min
Episode 9 0.0
Air date: 1978-01-10
Runtime: 25 min
Episode 10 0.0
Air date: 1987-01-06
Runtime: 25 min