There are nine Super Giant films and all of them were brought to the U.S. by Medallion Films, who turned them into four movies. This story would be The Artificial Satellite and the Destruction of Humanity and The Spaceship and the Clash of the Artificial Satellite combined to make one longer film. So basically, this would be the fifth and sixth parts of the story. If you want to get caught up, you’ll need to check out Atomic Rulers of the World and Invaders from Space. When you finish this one, you can get the rest of the story in Evil Brain from Outer Space.
Starman is a human-like being created from the strongest steel by the Peace Council of the Emerald Planet. He’s been sent to our planet to protect us from the Sapphire Galaxy, who are blowing up the Himalayans. To make their plan move quicker, they kidnap Dr. Yamanaka and his family and force him to use his spaceship — yes, he just so happens to have a spaceship — to decimate the Earth.
Strangely enough, this movie has a death star and a weapon that destroys planets. I mean, Star Wars would never steal anything from a Japanese movie, right?
You can download this from the Internet Archive.