Attack from Space

Also known as Ο Κυρίαρχος του Διαστήματος, Supermán contra la banda negra, Super Giant 5 & 6

The superhero Starman is sent by the Emerald Planet to protect Earth from belligerent aliens from the Sapphire Galaxy. The Sapphireans (or "Spherions") kidnap Dr. Yamanaka and force him to use his spaceship against the Earth.