After millennia of protecting humanity, the Eternals, powerful beings from another dimension, must unite to fend off returning alien threats. 5,000 years BC, a spaceship lands on Earth, heralding the Eternals' arrival. When a Deviant attacks a boy and his village, Eternals Akaris, Gilgamesh, Thea, and others step in to defend. Millennia later, living among humans, Eternals like Cersei and Sprite face a Deviant threat. Using their powers to manipulate reality, they combat the Deviants to protect humanity.