A young boy takes his mother's place in a group of gemstone-based beings, and must learn to control his powers. This series is set in the fictional Beach City, where ageless alien warriors, the Crystal Gems, live in an ancient beachside temple, protecting the world from evil. They project female humanoid forms from magical gemstones 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 his gemstone from his mother, the Gems' former leader Rose Quartz. As Steven tries to figure out his powers, he spends his days with his human father Greg, his friend Connie, other people in Beach City, 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 Gems to merge their identities and bodies to form a new and more powerful personality).
观众对《宇宙小子第三季》的评价两极分化，一方面认为剧情离谱、演员表现惊艳，另一方面认为编剧粗制滥造、剧情不合理。
该片以其深刻的战争描绘和人性的探讨赢得了观众的广泛赞誉。剧中的视觉效果和演员的精湛表演让人深刻体会影片的精彩之处。
它是一部值得一看的电影，通过其故事和表现手法，让观众反思剧内向观众表达的意义和人性的复杂！
这是一部非常特别的影片，没有大开大合的剧情，没有博人眼球的类型元素，没有贯穿到底的故事脉络。像是一杯温开水，看似平淡，却喝起来十分解渴。
说真的，《宇宙小子第三季》看完后我真的是久久不能平静！因为这部影片确实带给人的震撼太大了！不论是剧情节奏，还是剧情尺度，都让人不敢相信这是美国剧的水平。
