The spiritual leader of the Eternals, Ajak can heal others and is able to communicate with the Celestials. The Eternals are a race of immortal aliens from a distant planet who arrived on Earth thousands of years ago to protect humanity from a race of alien predators called Deviants. The Eternals were alerted to the Deviant threat by the Celestials, a race of cosmic builders whose fingerprints are on the very building blocks of life itself.