A stray missile from a confrontation between the Galman empire and the Bolar Federation crashes into the sun, turning it into a time bomb of radiation. The Star Force once again sets off into space, this time on a quest to look for a new world for the human race.
 
(Source: Anime News Network)

A year has passed since the Star Force returned to save the Earth but another danger now approaches from deep space. A gigantic White Comet hurtles toward our galaxy, obliterating everything in its path. But it is no ordinary comet - it is the deadly Comet Empire, conqueror of worlds and Earth is the next target! Against orders, the Star Force blasts off to investigate, but even if they can get past the flagship Andromeda, they don't yet know the true nature of their new enemy!

The Black Nebula Empire attacks Earth and threatens to blow up the planet with a bomb they placed on Earth if counter attacked. Earths hopes rest on the Yamato crew as they go to the Black Nebula Planet and try to find a way to difuse the bomb before it's too late.
 
(Source: Anime News Network)

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) 
Note: The 35mm cut for the film has a runtime of 152 minutes. While the 70mm extended cut is 163 minutes long and once held the record for the longest theatrical animated film in the world for 36 years.

Loose adaptation of the third season of Space Battleship Yamato, created by Takayuki Masuo.

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