A watery world called Aquarius that is destined to destroy all of the planet Earth. Can the great Yamato stop this devastation? Final Yamato (宇宙戦艦ヤマト・完結編 Uchuu Senkan Yamato Kanketsu Hen, lit. "Space Battleship Yamato: Final Saga") is a 1983 Japanese anime science fiction film and the fourth theatrical movie of the Space Battleship Yamato saga (known as Star Blazers in the United States). The 70mm print had a running time of 163 minutes, making Final Yamato the longest running animated film ever made. The water planet Aquarius is heading towards Earth after flooding the home planet of the warrior race of the Dinguil. The Dinguil use warp technology to make the planet move towards Earth faster than usual. The warrior race plans to flood Earth and make it their new home. When Earth learns of this, they make plans to evacuate humanity. Unfortunately, the Dinguil destroy the evacuation fleets. The space battleship Yamato, under the newly revived Jyuzo Okita (who seemingly died in the first season of the original series) now has to fight the Dinguil and stop Aquarius from flooding the Earth.

In the galactic group there are more than 100,000,000,000 galaxies, and the Milky Way galaxy, the one which includes Earth's solar system, is only one of these... one of many in the immensity of outer space. This story starts in the year 3199, when a mighty enemy attacks the Milky Way from a neighboring galaxy. The enemy engages the combined forces of the Milky Way, an Alliance of many stellar nations, and defeats them one after another. The remaining Milky Way Alliance forces are reduced to just six fleets. After the Alliance headquarters is destroyed, and when the collapse of the central Milky Way Alliance is imminent, the Great Yamato Zero surprises everyone and embarks on a mission to assist the Milky Way Alliance in one last great battle.