Steven Universe is an American animated television series created by Rebecca Sugar for Cartoon Network. It is the coming-of-age story of a young boy named Steven, who grows up with three magical aliens, the Crystal Gems Garnet, Amethyst and Pearl, and helps them protect the world from their own kind.Steven Universe is an American animated television series created by Rebecca Sugar for Cartoon Network. It is the coming-of-age story of a young boy named Steven, who grows up with three magical aliens, the Crystal Gems Garnet, Amethyst and Pearl, and helps them protect the world from their own kind.