In the fifth and final arc, Usagi and her friends are drawn into a battle against Shadow Galactica, a group of false Sailor Soldiers. Their leader, Sailor Galaxia, plans to steal the Sailor Crystals of true Soldiers to take over the galaxy and kill an evil lifeform known as Chaos. When Galaxia kills Mamoru and most of the Sailor Soldiers, she steals their Sailor Crystals. Usagi travels to the Galaxy Cauldron to defeat Galaxia and revive her teammates. Joining Usagi are the Sailor Starlights who come from the planet Kinmoku, their ruler Princess Kakyuu and the infant Sailor Chibichibi, who comes from the distant future. Later, Chibiusa and the Sailor Quartet join Usagi and company. After numerous battles and the death of Galaxia, Sailor Chibichibi reveals her true form as Sailor Cosmos. After defeating Chaos with the Silver Crystal, Usagi revives Mamoru and the Sailor Soldiers, before returning to Earth. The series ends with Usagi and Mamoru's wedding six years later.