The Xel'Naga are an ancient, cosmic race from the Star Craft universe—a fictional universe in which a series of computer games and books are set. The Xel'Naga helped the Protoss and the Zerg races to evolve. In the end, the Xel'Naga were destroyed by their own creation, the Zerg, when the Zerg Overmind launched an attack against them from the planet Zerus.