In the year 2199, the space battleship Yamato embarks on a voyage to the planet Iscandar, to retrieve a device that will rejuvenate a war-ravaged Earth.
The Earth Defense force mission is clear - take the newly rebuilt Yamato 148,000 light years to the planet Iscandar, to retrieve a machine called the Cosmo-Cleaner D which will save Earth from its irradiated state. But will the Gamilas stop them?
The Yamato tests out the Wave Motion Engine's warp capabilities, which will allow them to travel 148,000 light years to Iscandar and back in one year. But will the Gamilas stop them?
Dessler prepares another trap for the Yamato: an energy net that captures them. The only way out is in the direction of a massive sun, as a huge secret is revealed that might affect the crew.
Desslar commissions Gamilas General and war hero Domel to defeat the Yamato. The Yamato travels near a galactic whirlpool, but as assist from afar saves their mission.
Analyzer and Yuki fly down to a planet looking for food for the crew, but are captured by the inhabitants. Analyzer reveals a secret to Yuki that will change both of them.
The Yamato comes across a Gamilas fortress that emits Magnetron waves, which set vibrations into metals and rips them apart. Kodai and Sanada board the fortress using a new seamless plane that Sanada created. They destroy the base, and the Yamato flies on.
The Yamato reaches planet Balan, the halfway point in their mission to Iscandar. But Domel is waiting on his base there, and springs a trap that might destroy both the Yamato AND the base...
