When the Sun begins to expand in such a way that it will inevitably engulf and destroy the Earth in a hundred years, united mankind finds a way to avoid extinction by propelling the planet out of the Solar System using gigantic engines, moving it to a new home located four light years away, an epic journey that will last thousands of years.

As Usagi and her friends enjoy Christmas vacation, an unusual and fierce snowstorm hits town... The evil Snow Queen Kaguya has returned to claim Earth as her own. Crucial to Queen Kaguya's plan is a magical crystal from outer space, approaching Earth disguised as a comet. Once she gets hold of the crystal, she will have the power to suck away all life energy and cover the Earth in ice. Will Sailor Moon find the crystal before Queen Kaguya? Will her powers be enough to save the Earth from permanent winter? All hope lies with the Legendary Ultimate Scout Power!