In a forgotten corner of the universe, a group of immortal beings has been protecting humanity for thousands of years without anyone knowing. Creators on Earth since the first Homo sapiens began to evolve, these guardians of life are known as the Eternals. However, after the defeat of their eternal enemies, the Deviants, during the war that reached its peak centuries ago, these heroes chose to live in peace and remain unnoticed among mortals.
But when an imminent threat resurfaces in the form of Deviants, the Eternals are forced to unite once again and confront their ancient rivalries, as well as the hidden secrets they have kept in the shadows. Led by Ajak, a wise and powerful leader, and Sersi, who has a special bond with humanity, they must gather their old companions: from the strong Ikaris to the intriguing Thena.
As chaos ensues, the Eternals fight not only for the survival of humanity but also to understand their own purpose in a world they have protected, yet one that has often failed to show them gratitude. Their decisions will challenge notions of good and evil, revealing that the line between heroes and villains is thinner than it appears. Ultimately, this story intertwines the history of humanity with the vastness of the cosmos, inviting viewers to reflect on what it truly means to be a protector.