Thousands of years after arriving on Earth, a group of immortal beings known as the Eternals must reunite to protect humanity from the emergent threat of the Deviants. Each Eternal possesses unique abilities, and together they navigate internal conflicts, evolving human civilizations, and moral dilemmas about intervention and responsibility. The film explores themes of legacy, duty, and the consequences of long-lived existence, blending epic action with character-driven storytelling that examines both cosmic and human-scale challenges.