At its core, Eternals explores the tension between and human empathy . The titular characters are immortal synthetic beings created by the Celestials—cosmic architects who sow the seeds of life across the universe. For 7,000 years, the Eternals lived among humans under a strict directive: protect them from predatory "Deviants" but never interfere in human conflicts.

: The film's central conflict arises when the group discovers that Earth is merely an incubator for a new Celestial. Its birth will destroy the planet but create life elsewhere. This forces the heroes to choose between their creator’s grand design and the lives of the people they have come to love. Diversity and a New Cinematic Language

Despite its visual ambition, the film was divisive. Critics from sites like Kicking the Seat praised its willingness to pose "profound ethical questions," while others found the massive ensemble cast and 156-minute runtime cumbersome. Ultimately, the movie serves as a meditation on what it means to be "human"—arguing that humanity is defined not by biology, but by the capacity for love and sacrifice. Eternals (2021) - Kicking the Seat

: Characters like Thena (Angelina Jolie) suffer from "Mahd Wy'ry," a form of dementia caused by the accumulation of thousands of years of memories, reflecting the fragility of the mind when faced with eternity.