The pilot episode made for Uchuusen Sagittarius. Features the original comic book art and no voice acting. (Source: Wikipedia)

Earth's once green hills and rich blue oceans have been converted into a desolate wasteland by the relentless onslaught of planet bombs from the expansionist Gamilas Empire. By the year 2199, humankind has retreated to the depths of underground cities to escape the radiation. However, all hope is not lost, as the distant planet Iscandar offers Earth its final salvation: the Cosmo Reverse System, capable of restoring Earth's irradiated surface. In a desperate bid to retrieve this technology from Iscandar, the Earth Defense Force pours its remaining resources into the Yamato—an innovative, state-of-the-art battleship equipped with an infinite energy Wave Motion Engine. From young talent such as Tactical Officer Susumu Kodai to accomplished veterans like Captain Juuzou Okita, the Yamato's crew consists of many individuals, all varying in their experience on the battlefield. But despite their differences, one goal unifies them all: to complete their perilous 168,000 light-year voyage to Iscandar and save humanity from imminent doom.

The year is 2203, not long after the Bolar Federation was defeated by Desslok's Galman-Gamilon Empire. A subspace dimensional dislocation has caused a distant Red Galaxy to be relocated in a collision course with the Milky Way. Stars and planets collide, making a wreck of the Galman-Gamilon homeworld. The Star Force is dispatched to investigate. They reach Galmania to find Desslok's palace in ruins. As they pay their respects, tossing white roses down to the surface of the planet, a huge red planet crashes into Galmania, forcing to StarForce to escape with an immediate and uncalculated warp. (Source: AniDB)

The story is set in the year 2050 AD, and mankind has been steadily advancing its space technology. However, the planet is suddenly set upon by a mysterious enemy: the forces of Eldar, who came from 250 years in the future. In their time, 2300 AD, their planet Eldar was invaded by Earth, and soundly defeated by Earth's Trinity Energy, a mysterious energy used in their weaponry that possesses power many times that of a hydrogen bomb. The Eldar people's objective is to steal this Trinity Energy before it can be used against them. The Eldar forces begin by taking over Jupiter's moon Io, one of the places humanity has immigrated to by then. After that, they begin to attack Trinity City with their legions of Cosmosauruses in order to steal the Trinity Energy. Toshiya and his friends use God Sigma to protect the planet and the Trinity Energy, and the battle evolves into a long war to retake Io. (Source: Wikipedia)