The series is set in Beach City on the American East Coast, where the four Crystal Gems live in an ancient beachside temple, protecting the world from evil. Immortal alien warriors, they project female humanoid forms from magical gems that are the core of their being. The Crystal Gems are Garnet, Amethyst, Pearl -- and Steven, a young half-human, half-Gem boy who inherited the gem of his mother Rose Quartz, the former leader of the Crystal Gems. As Steven tries to figure out his powers, he spends his days with his human father Greg, his friend Connie or the other Gems, whether to help them save the world or just to hang out. He explores the abilities passed down to him by his mother, which include fusion -- the ability of two Gems to temporarily merge their identities and bodies to form a distinct new personality.